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The Infamous, Brain-Bending Birthday Problem

Video vocabulary

name

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US / neɪm /

UK / nem /

A1
  • noun
  • What something or someone is called
  • verb
  • To state what someone is called, e.g. John

skew

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US / skju: /

UK / skju /

C2
  • verb
  • To affect data making them incorrect or inaccurate
  • To affect ideas/thoughts making them incorrect

ninth

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US / naɪnθ /

UK / naɪnθ /

A1
  • noun
  • 9th

and

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US / ənd /

UK / ənd, ən,ænd /

A1
  • conjunction
  • Used to refer to two or more things
  • Plus; in addition; on top of that
  • Used to introduce an action that follows another

put

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US / pʊt /

UK / pʊt /

A1
  • phrasal verb
  • to make a light stop shining by pressing or moving a switch
  • verb
  • To move or place a thing in a particular position
  • To rate something in importance or value
  • To write or say something in a certain manner

keep

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US / ki:p /

UK / kip /

A1
  • noun
  • Large, strong tower in the middle of a castle
  • Money spent on you so you can live in a place
  • verb
  • To continue doing something; not to stop
  • To stop balls going in a goal in sports
  • To not give back or return something
  • (Of food) to not spoil or not rot
  • To take possession of something to own, e.g. a pet
  • To have and continue to hold something
  • To do something that you have promised or agreed
  • To stay in a certain place or condition
  • To maintain the rules

another

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US / əˈnʌðə(r) /

UK / əˈnʌðɚ /

A1
  • adjecitve
  • One more, but not this
  • determiner
  • One more added
  • pronoun
  • One more (thing)

help

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US / help /

UK / hɛlp /

A1
  • noun
  • Something given to enable a person to do something
  • Assistance given to someone in need
  • Someone who makes something easier or possible
  • verb
  • To act to enable a person to do something; assist
  • To make something better or less difficult

anonymize

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US / əˈnɒnɪmaɪz /

UK / əˈnɑːnɪmaɪz /

A1
  • transitive verb
  • Remove identifying particulars or details from (something, especially medical test results), typical

experiment

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US / ɪk'sperɪmənt /

UK / ɪkˈspɛrəmənt /

A2
  • noun
  • Test performed to assess new ideas or theories
  • verb
  • To create and perform tests to research something
  • To try something new that you haven't tried before

screen

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US / skri:n /

UK / skrin /

A2
  • noun
  • Wire net in a door or window to keep insects out
  • Displays in a theater on which movies are shown
  • Flat surface on a computer or TV showing images
  • verb
  • To hide or block something from being seen
  • To examine to find something, e.g. best candidate

only

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US / ˈəunli /

UK / ˈonli /

A1
  • adverb
  • Just one; just that amount or thing; not more than
  • Not very important or serious
  • Just that type of thing, person
  • Short time ago; not before a certain time
  • conjunction
  • Except; but

any

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US / 'enɪ /

UK / ˈɛni /

A1
  • adjecitve
  • One, or some, no matter which
  • pronoun
  • One (thing) of many; some

seventeen

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US / ˌsevnˈti:n /

UK / sev(ə)nˈtin /

A1
  • number
  • 17

real

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US / rɪəl /

UK / ˈriəl, ril /

A1
  • adjecitve
  • Actually existing or happening, not imagined
  • Being important or special

lot

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US / lɒt /

UK / lɑt /

A1
  • noun
  • What happens to a person in life from chance; fate
  • A group of people seen together
  • Item for sale at an auction
  • Small area of land used for a purpose e.g. parking

out

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US / aʊt /

UK / aʊt /

A1
  • adverb
  • No longer stylish (e.g. fashion)
  • Away from home, business, or the usual place
  • In a direction/movement away from inside or center
  • noun
  • Act when a batter cannot continue playing
  • verb
  • To tell people a secret

from

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US / frəm /

UK / frʌm, frɑm,frəm /

A1
  • preposition
  • Starting at a particular place, time or level

leap

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US / li:p /

UK / lip /

B1
  • noun
  • (Of prices) a quick large increase
  • A large forward step or jump
  • verb
  • To enter or start something eagerly
  • (Of prices) to increase quickly by a large amount
  • To jump over something

leave

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US / li:v /

UK / liv /

A1
  • noun
  • Permission to do something
  • Vacation time; time off work
  • verb
  • To go away from; depart
  • To gift property to someone after you die
  • To allow something to continue happening
  • To let something remain unused or available
  • To let something or someone remain somewhere

most

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US / məʊst /

UK / most /

A1
  • adverb
  • Very; extremely
  • Greatest possible degree
  • pronoun
  • Nearly all of something

variable

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US / ˈveəriəbl /

UK / ˈveriəbl /

A2
  • adjecitve
  • Having the ability to change or vary
  • noun
  • Mathematical quantity with several values

sometimes

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US / ˈsʌmtaɪmz /

UK / ˈsʌmˌtaɪmz /

A1
  • adverb
  • Only at certain times; occasionally

double

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US / 'dʌbl /

UK / ˈdʌbəl /

A2
  • adjecitve
  • Concerning or intended for use by two people
  • Two times the amount or degree; twice
  • Made of two parts that are the same, similar
  • noun
  • Person that is exactly like someone else
  • verb
  • To be used for two functions at the same time
  • To make or become twice as much

match

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US / mætʃ /

UK / mætʃ /

A2
  • noun
  • Something that is equal to or the same as another
  • Small stick you strike to light a fire candle etc.
  • A sports competition between two people or teams
  • Person or thing that goes well with another
  • verb
  • To equal or be as good as something else
  • To work well or look good with something else

share

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US / ʃeə(r) /

UK / ʃɛr /

A2
  • noun
  • Part-ownership in a property, business or company
  • Part of a company you own, shown by a certificate
  • verb
  • To divide something between two or more people
  • To allow others to use your things equally
  • To give information, etc. to someone

think

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US / θɪŋk /

UK / θɪŋk /

A1
  • verb
  • To have an idea about something without certainty
  • To have an idea, opinion or belief about something

picture

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US / 'pɪktʃə(r) /

UK / ˈpɪktʃɚ /

A1
  • noun
  • General situation or state of being
  • Mental image of what something is or looks like
  • Movie; film
  • Painting, drawing or photograph on paper or screen
  • verb
  • To understand or imagine something
  • To imagine someone or something in an image

lie

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US / laɪ /

UK / lai /

A2
  • noun
  • An untrue statement, when you know it is not true
  • verb
  • To be in a horizontal or flat position
  • To say something that you know is not true

where

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US / hwɛə /

UK / hwɛr, wɛr /

A1
  • conjunction
  • At or in the place which
  • In whatever place
  • pronoun
  • Word you use to ask the location of something

slash

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US / slæʃ /

UK / slæʃ /

B2
  • noun
  • Line ( / ) used in writing
  • Long, deep cut, caused by a sharp object
  • verb
  • To cut violently with a sharp object
  • To decrease something by a large amount

office

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US / ˈɒfɪs /

UK / ˈɔ:fɪs /

A1
  • noun
  • Room or building used for business
  • Important job position, often in a government

forty

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US / 'fɔ:tɪ /

UK / ˈfɔrti /

A1
  • number
  • 40

calculation

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US / ˌkælkjuˈleɪʃn /

UK / ˌkælkjəˈleʃən /

B2
  • noun
  • Process or result of using mathematics
  • An educated guess about something

february

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US / ˈfebruəri /

UK / ˈfebrueri /

A1
  • noun
  • 2nd month of the year

something

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US / ˈsʌmθɪŋ /

UK / ˈsʌmθɪŋ /

A1
  • adverb
  • In some degree or measure
  • noun
  • a person or thing of some value or consequence
  • pronoun
  • Thing that is not yet known or named
  • Approximately

august

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US / ɔːˈɡʌst /

UK / ɔːˈɡʌst /

A1
  • adjecitve
  • (of person) Well known and respected
  • noun
  • 8th month of the year

assign

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US / ə'saɪn /

UK / əˈsaɪn /

B2
  • verb
  • To give someone a particular job to do
  • To give someone credit or blame for something

two

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US / tu: /

UK / tu /

A1
  • number
  • 2

secret

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US / 'si:krət /

UK / 'si:krət /

A1
  • adjecitve
  • That you don't want others to know; private
  • noun
  • Information you do not want others to know

participate

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US / pɑ:ˈtɪsɪpeɪt /

UK / pɑ:rˈtɪsɪpeɪt /

B1
  • verb
  • To take part with others in doing something

hey

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US / heɪ /

UK / he /

A1
  • exclamation
  • What you say when you want someone's attention

nine

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US / naɪn /

UK / naɪn /

A1
  • number
  • 9

ten

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US / ten /

UK / tɛn /

A1
  • number
  • 10

base

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US / beɪs /

UK / bes /

A2
  • noun
  • Place military personnel live, train, and operate
  • Bottom part of an object that touches a surface
  • Unit of counting, e.g. 10 for counting
  • Most important idea or ingredient to add others
  • Origin or start from which something came
  • Main place where an organization or a person works
  • verb
  • To use as the starting point or origin for
  • To have as the main location for (company, etc.)

call

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US / kɔ:l /

UK / kɔl /

A1
  • noun
  • A order or request for action
  • The sound an animal makes, often when in danger
  • A correct prediction, e.g. a decision in a game
  • A short visit to a place or person
  • A decision by a referee or umpire in a game
  • verb
  • To make a request or order for action
  • (Animal) to make sounds to warn of danger
  • To announce the date of an election
  • To make a judgment about something
  • To give someone or something a name
  • To guess in advance the result or outcome
  • To visit a place or person for a short time
  • To phone someone
  • To speak, announce or shout in a loud voice

special

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US / 'speʃl /

UK / ˈspɛʃəl /

A1
  • adjecitve
  • Being additional or extra
  • Different, better or greater than normal
  • noun
  • Heavily discounted sales item

worth

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US / wɜ:θ /

UK / wɚθ /

A2
  • other
  • the financial, practical or moral value of somebody/something
  • having a particular value, especially in money

wonder

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US / 'wʌndə(r) /

UK / ˈwʌndɚ /

A1
  • noun
  • Surprise caused by experiencing something amazing
  • verb
  • To feel curious about something
  • To think or consider about something over time

pair

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US / peə(r) /

UK / per /

A2
  • noun
  • Two of the same thing, e.g. socks
  • Two people viewed together for some reason; couple
  • verb
  • To put two things or people together

why

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US / waɪ /

UK / hwaɪ, waɪ /

A1
  • adverb
  • Question word to ask for a reason
  • exclamation
  • (Used to express surprise or approval)

finite

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US / ˈfaɪnaɪt /

UK / ˈfaɪˌnaɪt /

B1
  • adjecitve
  • Having limits; lasting for a limited time

soon

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US / su:n /

UK / sun /

A1
  • adverb
  • At a time not long from now

street

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US / stri:t /

UK / strit /

A1
  • noun
  • Road in a city with buildings and places to walk

since

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US / sɪns /

UK / sɪns /

A1
  • adverb
  • At a point before the present time
  • conjunction
  • For this reason; because
  • preposition
  • From the time in the past that

logic

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US / ˈlɒdʒɪk /

UK / ˈlɑ:dʒɪk /

A2
  • noun
  • Proper, valid sensible reasoning
  • Scientific study of reasoning

eight

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US / eɪt /

UK / et /

A1
  • number
  • 8

sorry

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US / ˈsɒri /

UK / ˈsɑ:ri /

A1
  • exclamation
  • What you say to admit you were wrong
  • adjecitve
  • Causing others to feel pity; poor
  • Feeling regret or sympathy about wrong thing

ask

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US / ɑ:sk /

UK / æsk /

A1
  • verb
  • To say to someone that you want something

start

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US / stɑ:t /

UK / stɑrt /

A1
  • noun
  • First time or place that a thing exists; beginning
  • First opportunity to achieve something, e.g. a job
  • Sudden action or movement because you are scared
  • other
  • Beginning of something in place or time
  • verb
  • To do, be or happen for the first time; begin
  • To turn something on

probable

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US / ˈprɒbəbl /

UK / ˈprɑbəbəl /

A2
  • adjecitve
  • (Of a state or fact) likely to happen or be true

buddy

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US / 'bʌdɪ /

UK / ˈbʌdi /

B2
  • noun
  • Friend, usually male

computer

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US / kəmˈpju:tə(r) /

UK / kəmˈpjutɚ /

A1
  • noun
  • Machine for storing data, accessing the internet

well

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US / wel /

UK / wɛl /

A1
  • adjecitve
  • Being in a fortunate, good condition or state
  • Healthy and in good condition
  • adverb
  • In an acceptable, proper, or successful manner
  • In a complete, total, or full manner
  • A great and considerable degree
  • In a successful way, in a good or satisfactory way
  • exclamation
  • Used to begin or continue a particular statement
  • Used to show you want to start saying something
  • Used to express that you are waiting for a reply
  • You say this to change the topic of a conversation
  • Used to indicate you are making a final remark
  • noun
  • Long deep hole in the ground to get water
  • verb
  • To cause your eyes to fill with tears

sound

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US / saʊnd /

UK / saʊnd /

A1
  • adjecitve
  • Sensible, dependable and reliable
  • Unbroken or undisturbed, as of sleep
  • Firm or solid in structure
  • Sane; not mentally ill
  • Clearly reasoned; involving sense, good judgment
  • noun
  • Unique quality that characterizes a style of music
  • Waves traveling in air or water that can be heard
  • verb
  • To seem or appear to be, from what was said
  • To say in a clear deliberate manner
  • To make a noise, e.g. to ring a bell

just

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US / dʒʌst /

UK / dʒʌst /

A1
  • adjecitve
  • Proper or appropriate; as is deserved
  • Doing or being what is right or fair
  • Legally correct; having enough evidence
  • adverb
  • Almost; nearly
  • Exactly at the time of
  • Exactly (the same as, like)

diagnosis

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US / ˌdaɪəgˈnəʊsɪs /

UK / ˌdaɪəgˈnoʊsɪs /

B1
  • other
  • Judgments by a doctor about a person's illness

probability

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US / ˌprɒbəˈbɪləti /

UK / ˌprɑ:bəˈbɪləti /

A2
  • noun
  • What the chances are that something will happen

solid

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US / 'sɒlɪd /

UK / ˈsɑlɪd /

A2
  • adjecitve
  • Being able to be trusted; reliable
  • Substance that is hard or of fixed shape
  • Being well made and expected to last long
  • Having no space or emptiness inside
  • Being made entirely of one material or substance
  • noun
  • Something firm or hard; not gas or liquid

protection

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US / prəˈtekʃn /

UK / prəˈtɛkʃən /

A2
  • noun
  • Being kept from harm
  • Something that defends against harm or danger

fact

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US / fækt /

UK / fækt /

A1
  • noun
  • Something that is known or proved to be true

for

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US / fə(r) /

UK / fɔr,fə /

A1
  • preposition
  • Used to show the purpose, or need of something

pause

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US / pɔ:z /

UK / pɔz /

A2
  • noun
  • A temporary break before continuing
  • Function on a device to stop and restart it
  • Sign to hold a musical note a bit longer
  • verb
  • To stop doing for a while before continuing

cake

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US / keɪk /

UK / keɪk /

A1
  • noun
  • Sweet baked food made from flour, eggs, fat, sugar
  • verb
  • To cover with a thing that becomes hard when dried
  • To become dried into a hardened mass

cool

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US / ku:l /

UK / kul /

A1
  • adjecitve
  • Steady and calm when facing difficulties
  • Almost cold; not warm or hot
  • Smart or stylish in a way (young) people admire
  • Unfriendly in an indirect way; distant
  • verb
  • To make something decrease in temperature
  • (Of an emotion, etc.) to become less strongly felt

few

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US / fju: /

UK / fju /

A1
  • pronoun
  • Not many, a small number

wrap

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US / ræp /

UK / ræp /

B1
  • noun
  • Piece of clothing worn loosely on the shoulders
  • Thin bread filled with food and rolled
  • verb
  • To be or move around something
  • To cover something with paper or a cloth e.g. gift

much

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US / mʌtʃ /

UK / mʌtʃ /

A1
  • adjecitve
  • Very; to a high level or degree
  • adverb
  • A lot; large amount; a high degree of
  • Nearly; basically
  • On many occasions; often
  • noun
  • A large amount; a great quantity

math

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US / mæθ /

UK / mæθ /

A2
  • noun
  • Study or science of numbers and shapes

dataset

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US / 'deɪtəset /

UK / 'deɪtəset /

A1
  • other
  • An electronic device that provides an interface in the transmission of data to a remote station

those

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US / ðəʊz /

UK / ðoz /

A1
  • determiner
  • The people or things we are talking about
  • pronoun
  • The objects far from the speaker

time

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US / taɪm /

UK / taɪm /

A1
  • noun
  • Speed at which music is played; tempo
  • Point as shown on a clock, e.g. 3 p.m
  • Number of hours, minutes needed to do something
  • Occasion when something happens
  • Period or occasion that something occurred
  • Period in history or the past
  • Something measured in minutes, hours, days, etc.
  • How long an event takes; duration
  • verb
  • To check speed at which music is performed
  • To choose a specific moment to do something
  • To measure how long an event takes, e.g. a race
  • To schedule something to occur at a specific moment

grow

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US / ɡrəʊ /

UK / ɡro /

A1
  • verb
  • To get bigger and more mature; make plants do this
  • To improve; to develop better skills over time
  • To develop and become bigger or taller over time

like

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US / laɪk /

UK / laɪk /

A1
  • adjecitve
  • Being equal in status or kind to something else
  • Similar; the same
  • adverb
  • For example
  • preposition
  • Used as a filler; used to ad emphasis
  • In a way similar to the way something is done
  • Such as; for example
  • verb
  • To want to
  • To find something pleasing; to prefer something

baby

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US / ˈbeɪbi /

UK / ˈbeɪbi /

A2
  • adjecitve
  • Small in size; smaller than usual
  • noun
  • A very young child, who cannot yet speak
  • verb
  • To treat someone as if they were newly born

first

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US / fɜ:st /

UK / fɚst /

A1
  • adjecitve
  • 1st; Coming before all others in time or place
  • noun
  • Something that has not happened before
  • Position of the winner of a competition

twice

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US / twaɪs /

UK / twaɪs /

A1
  • adverb
  • Two times

offer

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US / 'ɒfə(r) /

UK / ˈɔfɚ, ˈɑfɚ /

A1
  • noun
  • Price you say you are willing to pay for something
  • Act of making a thing available to be accepted
  • verb
  • To suggest a price you are willing to pay
  • To give the opportunity to accept something
  • To say you are willing to do something
  • To give or say something as an act of worship

number

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US / ˈnʌmbə(r) /

UK / ˈnʌmbɚ /

A1
  • noun
  • Symbols such as 1, 2, 56, 793
  • Particular song or dance performed during a show
  • Total quantity or amount of things
  • verb
  • To put numbers on things
  • To assign a sequence within a group, series, set
  • To claim to be part of a larger group, series, set

cause

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US / kɔ:z /

UK / kɔz /

A2
  • noun
  • Belief, goal or organization that people support
  • Reason for
  • verb
  • To make something happen; create effect or result

about

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US / ə'baʊt /

UK / əˈbaʊt /

A1
  • adverb
  • To be ready to; going to
  • Nearly; approximately; roughly
  • Near; next to; close to
  • In every direction; in the area of
  • preposition
  • Concerning or of (a topic)

get

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US / ɡet /

UK / ɡɛt /

A1
  • verb
  • To become affected by illness or disease
  • To begin to feel or understand an emotion or idea
  • To send or bring someone or something home, etc.
  • To go somewhere to obtain something
  • To (cause to) do a particular thing
  • To obtain, receive or be given something
  • To currently have
  • To prepare for use
  • To understand something being said or read

what

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US / wɒt /

UK / hwɑt, hwʌt, wɔt, wʌt,hwət, wət /

A1
  • pronoun
  • Thing or things that; the same kind as
  • Used to emphasize something you are about to say
  • adjecitve
  • Used to refer to a particular amount, or number
  • Used to place emphasis on a particular quality
  • adverb
  • To a certain degree
  • determiner
  • Question words used for asking for information
  • exclamation
  • Used to express excitement, shock, or surprise
  • Used to ask people to repeat something they said

present

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US / 'preznt /

UK / ˈprɛznt /

A1
  • adjecitve
  • Being in attendance; being there; having turned up
  • noun
  • Gift
  • Verb tense indicating an action is happening now
  • Current time; now
  • verb
  • To introduce someone to others
  • To host a program on television or radio
  • To give a speech or presentation
  • To show something to someone who will examine it
  • To appear or happen
  • To give an award or prize to someone

fun

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US / fʌn /

UK / fʌn /

A1
  • adjecitve
  • Amusing and enjoyable
  • noun
  • Enjoyable or amusing quality or feeling

alter

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US / ˈɔ:ltə(r) /

UK / ˈɔltɚ /

A2
  • verb
  • To change so (clothing) fits better

least

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US / li:st /

UK / list /

A1
  • adverb
  • In the smallest or lowest way
  • noun
  • Something that is of the lowest or smallest degree

each

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US / i:tʃ /

UK / itʃ /

A1
  • determiner
  • Every one of two or more things
  • pronoun
  • Per one person or thing

right

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US / raɪt /

UK / raɪt /

A1
  • adjecitve
  • Correct or true
  • The south side of you looking at the rising sun
  • adverb
  • Exactly in a place or time
  • Being appropriate for a particular event
  • In a straight or direct manner
  • noun
  • Something you are legally or morally allowed to do
  • Ideal of what is just and good
  • Political view based on conservatism
  • verb
  • To fix something previously wrong or unjust
  • To make upright, as a boat that has turned over

people

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US / 'pi:pl /

UK / ˈpipəl /

A1
  • noun
  • Persons sharing culture, country, background, etc.
  • Men, Women, Children

thirty

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US / 'θɜ:tɪ /

UK / ˈθə:ti /

A1
  • number
  • 30

method

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US / 'meθəd /

UK / ˈmɛθəd /

A2
  • noun
  • (Organized and planned) way of doing something

hacker

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US / ˈhækə(r) /

UK / ˈhækɚ /

B1
  • noun
  • Person accessing computers without permission

then

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US / ðen /

UK / ðɛn /

A1
  • adverb
  • A time that is not now
  • Following another thing in time or arrangement
  • Following on reasonably from what was just stated
  • At that time, not now

interesting

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US / ˈɪntrəstɪŋ /

UK / ˈɪntrɪstɪŋ, -tərɪstɪŋ, -təˌrɛstɪŋ /

A1
  • adjecitve
  • Taking your attention; making you want to know
  • verb
  • To make someone want to know about something
  • To persuade to do, become involved with something

health

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US / helθ /

UK / hɛlθ /

A1
  • noun
  • (Person, company) being in a good condition; well

that

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US / ðæt /

UK / ðæt, ðət /

A1
  • adjecitve
  • The person or thing being talked about
  • Used to identify something both the speakers know
  • adverb
  • Used to reinforce adjectives and adverbs
  • To such a degree
  • conjunction
  • Used to connect a noun clause
  • Used to introduce an adverbial clause
  • Used to introduce a noun clause
  • determiner
  • Used as a noun to refer to something
  • pronoun
  • Referring an object far away
  • Used to refer to the relative pronoun ‘which’

second

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US / 'sekənd /

UK / ˈsɛkənd /

A1
  • adjecitve
  • 2nd; the one following first
  • noun
  • Unit of time; one sixtieth of a minute
  • Short period of time that you wait for someone
  • (Do) soon

watch

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US / wɒtʃ /

UK / wɑtʃ /

A1
  • noun
  • Period of time someone is responsible for guarding
  • Device you wear on your wrist that shows the time
  • Official warning statement, e.g. of bad weather
  • verb
  • To keep in check, manage, or control something
  • To look at something for entertainment, e.g. TV
  • To guard a place or people; protect child, etc.
  • To look at carefully to work out what is happening
  • To protect and care for someone or something

annual

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US / ˈænjuəl /

UK / ˈænjuəl /

A2
  • adjecitve
  • Happening once a year, or every year
  • noun
  • Book (in a series) released each year

great

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US / ɡreɪt /

UK / ɡret /

A1
  • adjecitve
  • Very large in size
  • Very important
  • Very good; fantastic; wonderful
  • adverb
  • Very good; better than before
  • noun
  • Successful and well-admired person

mean

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US / mi:n /

UK / min /

A1
  • adjecitve
  • Being good at
  • Nasty; unkind
  • Not liking to spend money; cheap; stingy
  • noun
  • Average of a set of numbers
  • verb
  • To express a particular idea or thought
  • To intend to do something in particular
  • To have a particular meaning or value

secure

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US / sɪ'kjʊə(r) /

UK / sɪˈkjʊr /

A2
  • adjecitve
  • Being attached to something tightly and surely
  • (Place that is) locked, guarded and safe
  • verb
  • To get or achieve something with certainty
  • To firmly attach something to something else
  • To protect from danger or harm, keep things safe

anyone

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US / ˈeniwʌn /

UK / ˈɛniˌwʌn, -wən /

A1
  • pronoun
  • Any person

example

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US / ɪgˈzɑ:mpl /

UK / ɪɡˈzæmpəl /

A1
  • noun
  • Thing, person which represents a category

comment

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US / 'kɒment /

UK / ˈkɑmɛnt /

A2
  • noun
  • Something you say, giving an opinion; remark
  • verb
  • To say something that gives your opinion

tell

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US / tel /

UK / tɛl /

A1
  • verb
  • To (strongly) advise a person to do something
  • To be able to guess
  • To say or communicate information to someone
  • To inform, but without speaking; indicate
  • To have a negative effect on someone
  • To order someone to do something; command
  • To recognize something based on certain signs
  • To report something to an authority
  • To explain something or teach someone something

lesson

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US / 'lesn /

UK / ˈlɛsən /

A1
  • noun
  • Something done to learn or teach something; class
  • Wisdom or knowledge received from an experience

down

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US / daʊn /

UK / daʊn /

A1
  • adjecitve
  • Being sad, sick, or unhappy
  • Not operating, working, or functioning as expected
  • adverb
  • In a sitting or lying position
  • Towards or on the ground, floor, or bottom
  • Written or copied onto a piece of paper or book
  • noun
  • A period of play in American Football
  • The soft, smooth hairs that cover a bird's body
  • preposition
  • Along something's path, course, or direction
  • Going from a higher position to a lower position
  • verb
  • To eat or drink very quickly and without stopping

include

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US / ɪnˈklu:d /

UK / ɪnˈklud /

A1
  • verb
  • To make someone, something part of a group

find

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US / faɪnd /

UK / faɪnd /

A1
  • noun
  • Object discovered by chance
  • Things that have been discovered from searching
  • verb
  • To become aware of something that is happening
  • To discover or meet by chance
  • To decide if someone is guilty of a crime, or not
  • To learn through study, research, or effort
  • To discover something by looking for it

happen

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US / 'hæpən /

UK / ˈhæpən /

A1
  • verb
  • To take place or occur

witness

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US / 'wɪtnəs /

UK / ˈwɪtnɪs /

B1
  • noun
  • Person who was present to see an event take place
  • Evidence or proof of something
  • verb
  • To see the signing of an official document
  • To see an event take place (usually a crime)
  • To serve as an example or evidence of something

anymore

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US / 'enɪmɔ: /

UK / ˌɛniˈmɔr, -ˈmor /

A2
  • adverb
  • No longer; no more

own

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US / əʊn /

UK / on /

A1
  • adjecitve
  • Belong to oneself
  • determiner
  • Yours, his, hers, etc.; not belonging to another
  • pronoun
  • (Something) belong to myself
  • verb
  • To have something as your property

even

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US / 'i:vn /

UK / ˈivən /

A1
  • adjecitve
  • Being equal in influence, power, possibility etc.
  • Being divided equally or fairly
  • (Of teams/contest) with similar chances of success
  • Smooth, level, or regular
  • Can be divided by 2; ending in 2, 4, 6, 8, or 0
  • At a regular, equally steady manner
  • Remaining steady and unchanging
  • adverb
  • (When this is surprising) as well; too
  • (Used to compare two things/stress the difference)
  • verb
  • To make something level; to flatten
  • To make something equal

value

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US / 'vælju: /

UK / ˈvælju /

A1
  • noun
  • Importance you attach to something
  • Some information expressed as a number
  • Stated price of something; worth
  • verb
  • To place a high importance on something
  • To say how much money something is worth

heart

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US / hɑ:t /

UK / hɑrt /

A1
  • noun
  • A feeling of care for others; compassion
  • Courage, confidence, and emotional strength
  • Be cheerfully encouraging
  • Most essential, important, or central part
  • Referring to a promise or something important
  • State or feelings of affection or deep love
  • Core part of a vegetable, e.g. a lettuce
  • The part of the body that pumps blood
  • Place where emotions are believed to be felt
  • A shape that represents love

add

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US / æd /

UK / æd /

A1
  • verb
  • To include as well
  • To put two things or numbers together, e.g. 2+2

risk

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US / rɪsk /

UK / rɪsk /

A1
  • noun
  • Actions that cause potential problems
  • verb
  • To do something potentially dangerous or foolish

change

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US / tʃeɪndʒ /

UK / tʃendʒ /

A1
  • noun
  • Exchange of one set of clothes for another
  • Money in the form of coins instead of paper
  • Money returned after giving too much
  • Act of making or becoming something else
  • verb
  • To exchange one set of clothes for another
  • To exchange one kind of money for another
  • To replace something with another thing
  • To make or become something else
  • To go from one train, bus, etc. and go to another

everyone

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US / ˈevriwʌn /

UK / ˈɛvriˌwʌn /

A1
  • pronoun
  • Every person; everybody

work

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US / wɜ:k /

UK / wɚk /

A1
  • adjecitve
  • Activity completed in order to make money
  • noun
  • The product of some artistic or literary endeavor
  • Everything created by an author, artist, musician
  • Activity you do in order to make money
  • Place of employment
  • Final product or result of a some labor or effort
  • verb
  • To bring into a specific state of success
  • To be functioning properly, e.g. a car
  • To do your job in your company or workplace
  • To make an effort to do something
  • To operate a machine or device

link

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US / lɪŋk /

UK / lɪŋk /

A2
  • noun
  • Any one of the rings that are part of a chain
  • Connection between two or more things or people
  • Webpage item you click to go to another webpage
  • verb
  • To join or connect together

hospital

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US / ˈhɒspɪtl /

UK / ˈhɑ:spɪtl /

A1
  • noun
  • Building for sick people, with doctors and nurses

collision

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US / kəˈlɪʒn /

UK / kəˈlɪʒən /

B2
  • noun
  • Act of crashing into someone or something else

take

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US / teɪk /

UK / tek /

A1
  • noun
  • Filming of a single scene for TV or the movies
  • verb
  • To accept something that is offered
  • To use a method of traveling, e.g. a bus or train
  • To use a camera to make (a photo)
  • To pick up something and go away with it
  • To study a subject in school
  • To attempt to pass (an exam)
  • To require a certain amount of time, money, space

its

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US / ɪts /

UK / ɪts /

A1
  • adjecitve
  • Referring to or belonging to ‘it’
  • determiner
  • Of something; belonging or related to something
  • other
  • Possessive form of “it”

empty

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US / 'emptɪ /

UK / ˈɛmpti /

A1
  • adjecitve
  • Containing nothing; with no contents
  • Without emotions, feelings, meaning or force
  • noun
  • Item, e.g. a bottle, whose contents have been used
  • verb
  • To remove the contents from something

multiply

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US / ˈmʌltɪplaɪ /

UK / ˈmʌltəˌplaɪ /

B1
  • verb
  • To increase in number by reproducing/having babies
  • To increase something by a large quantity
  • To have increased by a large quantity
  • To calculate two numbers e.g. 2 x 4

dutch

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US / dʌtʃ /

UK / dʌtʃ /

A1
  • adjecitve
  • Concerning the culture and people of Holland

move

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US / mu:v /

UK / muv /

A1
  • noun
  • Act of moving a playing piece in chess, etc.
  • An action; doing something
  • Step taken to achieve a goal
  • verb
  • To cause someone to have certain emotions
  • To cause something to change to a different place
  • To change where people live or a business operates
  • To take action to do or achieve something

twin

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US / twɪn /

UK / twɪn /

A2
  • noun
  • Two children born from same mother at same time
  • One of two things that closely resemble each other

scishow

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US / ə'lɜ:tnəs /

UK / ə'lɜ:tnəs /

A1

minimize

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US / 'mɪnɪmaɪz /

UK / ˈmɪnəˌmaɪz /

B1
  • verb
  • To make something seem small or less important

slight

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US / slaɪt /

UK / slaɪt /

B1
  • adjecitve
  • Small (amount, quality)
  • Appearing thin, delicate and physically weak
  • noun
  • Rude and disrepectful treatment
  • verb
  • To ignore or treat rudely and with no respect

who

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US / hu: /

UK / hu /

A1
  • pronoun
  • Which person
  • Used to introduce information about people

they

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US / ðeɪ /

UK / ðe /

A1
  • pronoun
  • Two or more people, animals, or things

result

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US / rɪ'zʌlt /

UK / rɪˈzʌlt /

A2
  • noun
  • Something produced through tests or experiments
  • Final score of a competition, election or game
  • verb
  • To be the outcome of other causes and effects

remove

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US / rɪˈmu:v /

UK / rɪˈmuv /

A1
  • verb
  • To get rid of something completely
  • To make someone leave his or her job or position
  • To move, erase or take away from a place
  • To take something off (e.g. clothing)

account

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US / ə'kaʊnt /

UK / əˈkaʊnt /

A1
  • noun
  • An advantage
  • Arrangement with a bank to keep your money for you
  • An invoice for things bought
  • Arrangement whereby you can use online services
  • A description, often written, of events; report

pairwise

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US / /

UK / /

A1
  • adjective
  • Involving or forming a pair or pairs.
  • adverb
  • In pairs.

possible

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US / ˈpɒsəbl /

UK / ˈpɑsəbəl /

A1
  • adjecitve
  • Being able or appropriate for a task or purpose
  • Having a chance of happening, or being true

else

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US / els /

UK / ɛls /

A1
  • adverb
  • Otherwise; if you fail to
  • (Of person place thing etc.) besides; in addition

chance

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US / tʃɑ:ns /

UK / tʃæns /

A1
  • adjecitve
  • Happening by luck; not planned
  • Taking a risk to try something
  • noun
  • The way something happens without planning
  • An opportunity; favorable circumstances, situation
  • The possibility that something will happen
  • verb
  • To occur just through luck; happen
  • To take a risk to try something

thank

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US / θæŋk /

UK / θæŋk /

A1
  • verb
  • To tell someone you are grateful to them

look

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US / lʊk /

UK / lʊk /

A1
  • noun
  • Person's beauty or physical attractiveness
  • Particular style of dress, clothes, or appearance
  • The way someone, something appears to be
  • Act of searching for or examining something
  • verb
  • To appear to be; seem

produce

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US / prə'dju:s /

UK / prəˈdus, -ˈdjus, pro- /

A1
  • noun
  • Fresh foods such as fruits and vegetables
  • verb
  • To grow something naturally
  • To make something appear
  • To manufacture something using machines
  • To control the making a movie or television show

both

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US / bəuθ /

UK / boθ /

A1
  • determiner
  • Used to refer to two things at the same time
  • pronoun
  • Used to refer to two things at the same time

way

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US / weɪ /

UK / we /

A1
  • adverb
  • Used to emphasize the amount of something
  • noun
  • Particular aspect of something being thought about
  • One of various choices that could be made
  • Particular existing condition or state
  • (Often long) distance or length of time
  • How something is done
  • Route to go to a place
  • Small street
  • Usual behavior, emotions or habits of someone

their

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US / ðɛː /

UK / ðer /

A1
  • determiner
  • Belonging to them

pretty

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US / 'prɪtɪ /

UK / ˈprɪti /

A1
  • adjecitve
  • Being attractive to the eye in a simple way
  • adverb
  • Very; to a great degree

yes

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US / jes /

UK / jɛs /

A1
  • adverb
  • Way to say you agree or will do something

celebrate

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US / 'selɪbreɪt /

UK / ˈsɛləˌbret /

A2
  • verb
  • To observe an event or occasion, e.g. a birthday
  • To lead or participate in a religious ceremony
  • To express praise or thanks for something

all

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US / ɔ:l /

UK / ɔl /

A1
  • adverb
  • Completely; totally
  • determiner
  • Being every one of something
  • pronoun
  • 100% of something; the complete amount

room

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US / ru:m /

UK / rum, rʊm /

A1
  • noun
  • All of the people inside a particular room
  • Part of building enclosed by walls, e.g. kitchen
  • Opportunity to exist, happen, or be true
  • verb
  • To share a home with someone

catalogue

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US / ˈkætəlɒg /

UK / ˈkætlˌɔɡ, -ˌɑɡ /

B1
  • noun
  • Book of items that are available for purchase

error

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US / ˈerə(r) /

UK / ˈɛrɚ /

A2
  • noun
  • Something that is not correct; a mistake

super

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US / ˈsu:pə(r) /

UK / ˈsupɚ /

A2
  • adjecitve
  • Of the highest quality; great; marvelous

combine

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US / kəmˈbaɪn /

UK / kəmˈbaɪn /

A2
  • verb
  • To mix several things together to form one thing

actually

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US / ˈæktʃuəli /

UK / ˈæktʃuəli /

A1
  • adverb
  • Used to add new (often different) information

surely

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US / ˈʃʊəli /

UK / ˈʃʊrli /

A1
  • adverb
  • With certainty; definitely

ever

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US / 'evə(r) /

UK / ˈɛvɚ /

A1
  • adverb
  • At any time; at all times in the future

once

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US / wʌns /

UK / wʌns /

A1
  • adverb
  • One time; one instance
  • At a time in the past
  • conjunction
  • When; as soon as

use

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US / ju:s /

UK / ju:s /

A1
  • noun
  • Ability to employ something
  • Need to enable it to work
  • Permission to do something with something
  • Act of spending money
  • Operation of a machine for its function
  • verb
  • To have; to eat, drink, consume etc.
  • To need to operate or work
  • To operate a machine, e.g. a computer
  • To treat a person badly
  • To do something with, for a task or purpose

obviously

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US / ˈɒbviəsli /

UK / ˈɑːbviəsli /

A2
  • adverb
  • In a way that is obvious/easy to see or understand

attack

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US / ə'tæk /

UK / əˈtæk /

A2
  • noun
  • Act intended to hurt someone physically, mentally
  • verb
  • To try to destroy, beat, or injure

calendar

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US / ˈkælɪndə(r) /

UK / ˈkæləndɚ /

B1
  • noun
  • A table showing the days, months and years

four

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US / fɔ:(r) /

UK / fɔr, for /

A1
  • number
  • 4

new

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US / nju: /

UK / nu, nju /

A1
  • adjecitve
  • Not old, recently born, built or made
  • Being or doing something for the first time
  • Not felt, seen or known previously
  • Having been recently bought or obtained

too

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US / tu: /

UK / tu /

A1
  • adverb
  • In addition, also; with emphasis
  • Say that something is more than you want

programming

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US / ˈprəʊgræmɪŋ /

UK / ˈproʊgræmɪŋ /

A1
  • noun
  • Writing computer code for a piece of software
  • TV or radio shows broadcast by a station
  • verb
  • To make someone act or think in a certain way
  • To write computer code for a piece of software

here

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US / hɪə(r) /

UK / hɪr /

A1
  • adverb
  • In this place; at this location, position or time

listen

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US / ˈlɪsn /

UK / ˈlɪsən /

A1
  • verb
  • To carefully consider what someone is saying

input

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US / ˈɪnpʊt /

UK / ˈɪnˌpʊt /

A2
  • noun
  • Advice or ideas that someone provides
  • verb
  • To put in information, advice or opinions

after

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US / 'ɑ:ftə(r) /

UK / ˈæftɚ /

A1
  • adverb
  • Later than another time, or behind something
  • conjunction
  • Following something before
  • preposition
  • When an event happened or time has passed

sort

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US / sɔ:t /

UK / sɔrt /

A1
  • noun
  • Group or class of similar things or people
  • verb
  • To organize things by putting them into groups
  • To deal with things in an organized way

perfectly

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US / ˈpɜ:fɪktli /

UK / ˈpəfɪktli /

A2
  • adverb
  • In a faultless manner; without mistakes

science

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US / 'saɪəns /

UK / ˈsaɪəns /

A2
  • noun
  • Study of the physical world, based on facts

thousand

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US / ˈθaʊznd /

UK / ˈθaʊzənd /

A1
  • number
  • Number 1,000

puzzle

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US / 'pʌzl /

UK / ˈpʌzəl /

A2
  • noun
  • Something challenging to explain or understand
  • Game requiring the player to find an answer
  • Game with many pieces, e.g. forming a picture
  • A problem requiring thought and skill to be solved
  • verb
  • To be a challenge to understand; confuse

day

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US / deɪ /

UK / de /

A1
  • noun
  • A period of 24 hours beginning at midnight
  • The period of time when it is light outside
  • Person's name

point

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US / pɔɪnt /

UK / pɔɪnt /

A1
  • noun
  • An item to be discussed
  • Small spot or dot
  • Fact or detail
  • Feature of something
  • The size of the text on a page or screen
  • A certain time or stage in a process
  • Certain position in time or space
  • Idea or fact you try to convince people about
  • Measurement of scores in a game, sport
  • Sharp end of something, e.g. a pen or pin
  • verb
  • To face a certain direction, e.g. north
  • To indicate something with your finger to others

while

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US / waɪl /

UK / hwaɪl, waɪl /

A1
  • conjunction
  • In spite of the fact that; although
  • During the time that; at the same time
  • noun
  • Short amount of time

popular

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US / ˈpɒpjələ(r) /

UK / ˈpɑ:pjələ(r) /

A1
  • adjecitve
  • Liked or enjoyed by many people

story

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US / 'stɔ:rɪ /

UK / ˈstɔri, ˈstori /

A1
  • noun
  • One of many floors or levels in a building
  • Account or description of how something happened

medical

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US / ˈmedɪkl /

UK / ˈmɛdɪkəl /

A2
  • adjecitve
  • Of or relating to physical health or medicine
  • noun
  • A health check or test

develop

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US / dɪ'veləp /

UK / dɪˈvɛləp /

A1
  • verb
  • To explain something in steps and in detail
  • To create or think of something
  • To grow bigger, more complex, or more advanced
  • To make a photograph from film

guess

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US / ɡes /

UK / ɡɛs /

A1
  • noun
  • Answer given when you don't know if it is correct
  • verb
  • To give an answer without knowing if it is correct

code

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US / kəʊd /

UK / kod /

A2
  • noun
  • A password made of a set of letters or numbers
  • Set of rules for behavior
  • A secret language using secret symbols
  • Written part of a computer program
  • verb
  • To express information in a series of numbers
  • To write a secret message using secret symbols
  • To write programs using computer languages

skill

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US / skɪl /

UK / skɪl /

A2
  • noun
  • Ability to do something well

will

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US / wɪl /

UK / wɪl /

A1
  • noun
  • Desire or choice of someone
  • Document saying who gets your money when you die
  • Strong desire to do something; determination
  • Desire to do something; strong wish to do
  • other
  • Used with verbs to express the future
  • verb
  • To leave property to someone after your death
  • To use mental effort to make something happen
  • Am (is, are) likely to do
  • To influence someone to do something
  • To make something happen by strongly wanting it

third

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US / θɜ:d /

UK / θɜ:rd /

A1
  • adjecitve
  • 3rd: Number after second

feel

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US / fi:l /

UK / fil /

A1
  • verb
  • To be aware of or experience an emotion, sensation
  • To sense through direct contact; touch

equivalent

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US / ɪˈkwɪvələnt /

UK / ɪˈkwɪvələnt /

B1
  • adjecitve
  • Equal to something in value, use or meaning
  • noun
  • Thing like another in quality, quantity or degree

many

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US / 'menɪ /

UK / ˈmɛni /

A1
  • determiner
  • Used to refer a large number of things

someone

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US / ˈsʌmwʌn /

UK / ˈsʌmˌwʌn, -wən /

A1
  • pronoun
  • Person who is not known or named

complicate

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US / ˈkɒmplɪkeɪt /

UK / ˈkɑ:mplɪkeɪt /

B1
  • verb
  • To make more difficult to do, understand or use

occupy

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US / 'ɒkjʊpaɪ /

UK / ˈɑkjəˌpaɪ /

A2
  • verb
  • To enter and take control of land/property
  • To fill a time, a space, or an area
  • To live in a particular building
  • To fill someone's thoughts or make a person busy

our

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US / 'aʊə(r) /

UK / aʊr /

A1
  • determiner
  • Belonging to us

give

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US / ɡɪv /

UK / ɡɪv /

A1
  • noun
  • Degree of flexibility in something, a material
  • verb
  • To hand over or present something to someone
  • To cause someone to have or experience something

commonly

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US / ˈkɒmənli /

UK / ˈkɑmənlɪ /

A2
  • adverb
  • Typically, normally; not unusually

comparison

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US / kəmˈpærɪsn /

UK / kəmˈpærɪsən /

A2
  • noun
  • Act of comparing things

safety

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US / ˈseɪfti /

UK / ˈsefti /

A1
  • noun
  • Device on a gun to prevent accidental shooting
  • State of being free from harm or danger

support

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US / səˈpɔ:t /

UK / səˈpɔrt, -ˈport /

A1
  • noun
  • Assistance or advice given to someone
  • Evidence that helps prove something is true
  • A thing to hold up or prevent from falling down
  • verb
  • To give assistance or advice to someone
  • To help prove or show that something is true
  • To hold up or prevent from falling down

box

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US / bɒks /

UK / bɑ:ks /

A1
  • noun
  • A marked area of a baseball field
  • A container with four straight sides and a lid
  • Area of seating in a theater separated from others
  • A 4 sided container or shape printed on a page
  • Entire amount of something inside a container
  • verb
  • To strike someone on the side of the head
  • To pack an object in a six-sided container
  • To fight with gloved hands as a sport

save

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US / seɪv /

UK / sev /

A1
  • noun
  • Preventing a player in a game from scoring a goal
  • preposition
  • Except; not including
  • verb
  • To make your computer keep a file
  • To keep for future use
  • To make something unnecessary; prevent
  • To keep money so that you will have it later
  • To keep something for future use, such as money
  • To keep or rescue someone or something from harm
  • To prevent a player in a game from scoring a goal
  • To avoid the unnecessary waste of energy, etc.

randomly

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US / 'rændəmlɪ /

UK / 'rændəmlɪ /

B1
  • adverb
  • With no pattern or clear purpose; by chance

crazy

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US / 'kreɪzɪ /

UK / ˈkrezi /

A2
  • adjecitve
  • Mentally ill; mad
  • Not being sensible or practical
  • Really like someone or something very much
  • noun
  • Person acting in a manner that is strange and odd

now

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US / naʊ /

UK / naʊ /

A1
  • adverb
  • At the present time or moment
  • Right away or in the next possible moment
  • Used to refer to something that just happened
  • Time between the present and a moment in the past
  • conjunction
  • Resulting from or because of something

really

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US / ˈri:əli /

UK / ˈriəˌli, ˈrili /

A1
  • adverb
  • Used to stress something that is said; definitely
  • In a true or accurate manner
  • Very

trial

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US / ˈtraɪəl /

UK / ˈtraɪəl, traɪl /

A2
  • adjecitve
  • Being made or done as a test or experiment
  • noun
  • Hearing and judgment of a case in court
  • Act or process of testing or experimenting
  • verb
  • To be made or done as a test or experiment

compare

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US / kəm'peə(r) /

UK / kəmˈpɛr /

A1
  • verb
  • To consider how similar and different things are

shout

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US / ʃaʊt /

UK / ʃaʊt /

A2
  • noun
  • Speaking loudly so you get attention
  • verb
  • To speak very loudly to get attention

pick

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US / pɪk /

UK / pɪk /

A1
  • noun
  • Sharp tool used for breaking the ground
  • Item selected from a group of choices
  • verb
  • To take fruit or vegetables from a plant or tree
  • To decide on a thing from various choices; select
  • To remove (flower, etc.) with your fingers

same

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US / seɪm /

UK / sem /

A1
  • adjecitve
  • Being equal in quality and amount
  • Identical; not different
  • Not changing; constant

survey

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US / 'sɜ:veɪ /

UK / ˈsɜː(r)veɪ /

A2
  • noun
  • Broad view or general description of something
  • Act of measuring land or property to make a map
  • Set of questions used to ask people about a topic
  • verb
  • To offer a broad view or general description
  • To measure an area of land to make a map of it
  • To ask people a question about a particular topic

study

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US / 'stʌdɪ /

UK / ˈstʌdi /

A1
  • noun
  • Room that a person studies or reads in
  • Piece of research
  • Topic or subject you research or learn about
  • verb
  • To focus on learning something usually at school

nobody

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US / ˈnəʊbədi /

UK / ˈnoʊbədi /

A1
  • pronoun
  • No person; no one; not any person

want

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US / wɔnt /

UK / wɑnt, wɔnt /

A1
  • noun
  • Something you desire or wish for
  • State or condition of poverty
  • verb
  • To desire or wish for something; hope for a thing

fifth

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US / fɪfθ /

UK / fɪfθ /

A1
  • noun
  • 5th

themselves

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US / ðəmˈselvz /

UK / ðɛmˈsɛlvz, ðəm- /

A1
  • pronoun
  • Reflexive form of 'they'

seventy

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US / ˈsevnti /

UK / ˈsɛvənti /

A1
  • number
  • 70

whole

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US / həul /

UK / hol /

A1
  • adjecitve
  • Complete or full; all of
  • Being in a good condition
  • noun
  • Complete amount or sum; total

please

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US / pli:z /

UK / pliz /

A1
  • adverb
  • Used when you politely ask people for things
  • verb
  • To entertain someone, by dancing, singing etc.
  • To make someone happy by doing something

mine

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US / maɪn /

UK / maɪn /

A1
  • noun
  • A bomb hidden in the ground or the sea
  • Rich source of material or information
  • Place under the ground where coal, etc. is dug out
  • pronoun
  • That thing that belongs to me
  • verb
  • To place a bomb in the ground or the sea
  • To dig into the earth or sea to obtain minerals

can

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US / kæn /

UK / kən,kæn /

A1
  • noun
  • A metal container for storing food
  • other
  • Able to; have the skill to; have the time to
  • verb
  • To have permission to
  • To be possible to do
  • To preserve food by sealing it in a metal container

video

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US / 'vɪdɪəʊ /

UK / ˈvɪdiˌo /

A2
  • adjecitve
  • Of a moving film, with sound
  • noun
  • Recording capturing action with sound
  • verb
  • To make a moving film of, with sound

description

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US / dɪˈskrɪpʃn /

UK / dɪˈskrɪpʃən /

A2
  • noun
  • Explanation of what something is like, looks like

distribute

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US / dɪˈstrɪbju:t /

UK / dɪˈstrɪbjut /

A2
  • verb
  • To hand out or give to people
  • To send products to stores to sell
  • To spread something over an area

online

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US / ˌɒnˈlaɪn /

UK / ˌɑ:nˈlaɪn /

B1
  • adjecitve
  • Connected to the internet

vulnerable

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US / ˈvʌlnərəbl /

UK / ˈvʌlnərəbəl /

B1
  • adjecitve
  • Being open to attack or damage
  • Being easily harmed, hurt, or wounded

address

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US / ə'dres /

UK / əˈdrɛs /

A1
  • noun
  • Exact street location of a place
  • A formal speech to a group of people
  • verb
  • To write the place someone lives on a letter
  • To refer to someone or something formally
  • To make a formal speech to a group of people
  • To try to find a solution to; think about

overlap

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US / ˌəʊvəˈlæp /

UK / ˌoʊvərˈlæp /

B1
  • noun
  • Amount shared in the same space, form, idea
  • verb
  • To lie over or cover a part of something else
  • To happen at the same time as another event
  • To share qualities or functions

would

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US / wʊd /

UK / wʊd /

A1
  • other
  • Used to indicate something imagined
  • Used to ask or request something politely
  • Verb used to indicate possibility, request etc.
  • Used to indicate a preference
  • Used to indicate a reaction
  • Indicates something that occurred repeatedly
  • Used to indicate willingness or ability to do

july

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US / dʒuˈlaɪ /

UK / dʒʊˈlaɪ /

A1
  • noun
  • 7th month of the year

september

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US / sepˈtembə(r) /

UK / sɛpˈtɛmbɚ /

A1
  • noun
  • 9th month of the year

seven

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US / ˈsevn /

UK / ˈsɛvən /

A1
  • number
  • Number 7

platform

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US / 'plætfɔ:m /

UK / ˈplætˌfɔrm /

B1
  • noun
  • Flat, raised structure that people stand on
  • Area from which you board a train at a station

good

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US / ɡʊd /

UK / ɡʊd /

A1
  • adjecitve
  • Proper, appropriate or right
  • (Of an amount) enough; plenty
  • Excellent; high quality
  • Acting well or properly; of moral character
  • In a positive or happy emotional state
  • noun
  • Advantage or benefit

output

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US / 'aʊtpʊt /

UK / ˈaʊtˌpʊt /

A2
  • noun
  • Amount of something that is produced
  • verb
  • To produce data or information, as a computer

but

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US / bət /

UK / bʌt,bət /

A1
  • conjunction
  • Used before you say something different, opposite

disease

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US / dɪˈzi:z /

UK / dɪˈziz /

A2
  • noun
  • Illness that affects a person, animal, or plant

equal

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US / 'i:kwəl /

UK / ˈikwəl /

A1
  • adjecitve
  • Same in shape, size, or number
  • verb
  • To add up or be the same as

span

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US / spæn /

UK / spæn /

B1
  • noun
  • Distance between two supports of a bridge
  • Period of time that something continues for
  • other
  • Periods of time that something continues for
  • verb
  • To go across a certain distance between things
  • To cover or extend over a time period

fifty

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US / 'fɪftɪ /

UK / ˈfɪfti /

A1
  • number
  • 50

hash

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US / hæʃ /

UK / hæʃ /

C1
  • noun
  • A mixture of meat, potatoes, and vegetables cut into small pieces and baked or fried
  • The symbol # on a phone or computer keyboard

collect

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US / kəˈlekt /

UK / kəˈlɛkt /

A2
  • adverb
  • By asking the receiver of a call to pay for it
  • verb
  • To ask for money, e.g. for a charity
  • To gather things, people together in one place
  • To get and keep one type of things as a hobby
  • To take things and bring them together
  • To go and receive, e.g. a prize or an award
  • To take control of your own feelings or thoughts

not

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US / nɒt /

UK / nɑt /

A1
  • adverb
  • Word indicating the negative
  • (Used to form the negative of verbs)

brilliant

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US / 'brɪlɪənt /

UK / ˈbrɪljənt /

A2
  • adjecitve
  • Having a great amount of intelligence or talent
  • Being very bright, like a diamond; shining

against

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US / əˈgenst /

UK / əˈɡenst /

A1
  • preposition
  • In physical contact with, as for support; next to
  • In opposition to; disagreeing with

calculate

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US / 'kælkjʊleɪt /

UK / ˈkælkjəˌlet /

B2
  • verb
  • To find an answer using mathematics
  • To make an educated guess about something

onto

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US / ˈɒntə /

UK / ˈɑnˌtu, -tə, ˈɔn- /

A1
  • preposition
  • Towards a certain direction/into a certain area

decade

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US / ˈdekeɪd /

UK / ˈdɛkˌed, dɛˈked /

B1
  • noun
  • Period of 10 years

month

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US / mʌnθ /

UK / mʌnθ /

A1
  • noun
  • One of 12 28-31 day periods in the year

count

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US / kaʊnt /

UK / kaʊnt /

A2
  • noun
  • Number of things added together, e.g. votes
  • With the number of crimes, knockouts, as stated
  • verb
  • To add things together to find the total number
  • To matter or be important
  • To include someone or something in a final number

premium

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US / ˈpri:miəm /

UK / ˈprimiəm /

B1
  • adjecitve
  • Having a higher than normal quality
  • noun
  • Money paid as a fee for insurance

scientist

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US / ˈsaɪəntɪst /

UK / ˈsaɪəntɪst /

A2
  • noun
  • Person who is trained in a science

world

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US / wɜ:ld /

UK / wɜrld /

A1
  • noun
  • All the humans, events, activities on the earth
  • Political division due to some kind of similarity

sponsor

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US / ˈspɒnsə(r) /

UK / ˈspɑ:nsə(r) /

B1
  • noun
  • Person that supports the passage of a new law
  • Person giving money for someone's education
  • verb
  • To support the passage of a new law
  • To help someone succeed by giving them money
  • To pay for an event, usually as an advertisement

protect

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US / prə'tekt /

UK / prəˈtɛkt /

A1
  • verb
  • To defend someone or something from harm or danger

interactive

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US / ˌɪntərˈæktɪv /

UK / ˌɪntɚˈæktɪv /

A2
  • adjecitve
  • Acting or influencing others

before

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US / bɪˈfɔ:(r) /

UK / bɪˈfɔr,-ˈfor /

A1
  • adverb
  • At a time earlier than the present; previously
  • conjunction
  • In advance of something happening
  • preposition
  • In front of someone or something

problem

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US / ˈprɒbləm /

UK / ˈprɑbləm /

A1
  • adjecitve
  • Causing trouble
  • noun
  • Something difficult to deal with or causes trouble
  • Question to show understanding of a math concept

with

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US / wɪð /

UK / wɪð, wɪθ /

A1
  • preposition
  • As an employee of a certain company
  • Against something or someone
  • By using something as a means
  • Due to; because of
  • Including
  • Possessing as a feature
  • Related to
  • (Of the manner/attitude by which you do something)
  • Used to express that people or things are together

sixty

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US / 'sɪkstɪ /

UK / ˈsɪksti /

A1
  • number
  • 60

quirky

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US / 'kwɜ:kɪ /

UK / 'kwɜ:kɪ /

B2
  • adjecitve
  • Odd or unusual; strange

percent

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US / pə'sent /

UK / pɚˈsɛnt /

A2
  • adverb
  • One one-hundredth of a whole; the symbol %

ninety

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US / 'naɪntɪ /

UK / ˈnaɪnti /

A1
  • number
  • 90

sec

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US / sek /

UK / sɛk /

A1
  • noun
  • Shortened form of 'second'

could

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US / kəd /

UK / kʊd /

A1
  • other
  • Past form of 'can' to mean have ability
  • Used to ask for something politely, or to offer

information

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US / ˌɪnfəˈmeɪʃn /

UK / ˌɪnfɚˈmeʃən /

A1
  • noun
  • Collection of facts and details about something

blow

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US / bləʊ /

UK / blo /

A2
  • noun
  • Something that causes you difficulty or sadness
  • Act of making air come out of your mouth
  • A hit or strike from an object
  • verb
  • To move something using air
  • To make air come quickly out of your mouth
  • To clear something by forcing air through it

behind

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US / bɪˈhaɪnd /

UK / bɪˈhaɪnd /

A1
  • adjecitve
  • Concerning a later or slower time than expected
  • Being in a losing position in a sporting event
  • Being in the past; old fashioned
  • adverb
  • Remaining
  • noun
  • The part of the body that one sits on
  • preposition
  • At or toward the back of someone or something
  • Supporting or helping someone

hear

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US / hɪə(r) /

UK / hɪr /

A1
  • verb
  • To be aware of sound; to perceive with the ear
  • To be told or find out information or facts
  • To consider or listen to a court case

bear

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US / bɛː /

UK / bɛr /

A2
  • noun
  • Large brown animal with fur that lives in forests
  • Someone who expects stock market to fall
  • verb
  • To accept (responsibilities or duties)
  • To give birth to a child; to produce fruit
  • To accept or suffer the weight of difficulties
  • To keep moving left or right while going forward
  • To show (sign of something)
  • To support the weight of something, e.g. a bridge

gather

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US / ˈgæðə(r) /

UK / ˈɡæðɚ /

A2
  • noun
  • Fold in cloth, as in a full skirt
  • verb
  • To bring objects together into one place
  • (Of liquids) To come to a head, as in boil
  • To collect foods such as wild berries or crops
  • To increase or accumulate
  • To bring people, animals together into a group
  • To activate strength, courage to prepare for task
  • To understand or believe some information

community

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US / kə'mju:nətɪ /

UK / kəˈmjunɪti /

A2
  • noun
  • Group of people who share a common idea or area

have

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US / həv /

UK / hæv /

A1
  • verb
  • To drink, smoke, eat or use something
  • To experience the effects of something
  • To organize an event, or join in an activity
  • To own, possess, or hold something
  • To cause to happen or produce a particular effect

hundred

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US / 'hʌndrəd /

UK / ˈhʌndrɪd /

A1
  • number
  • 100

see

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US / si: /

UK / si /

A1
  • verb
  • To go on a date with someone
  • To predict whether something is, or will be true
  • To understand what someone says
  • To use your eyes to look at something
  • To visit a place often for sightseeing or pleasure
  • To visit or meet with someone
  • To find out by waiting or looking
  • To watch (a game, movie or TV show)

end

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US / end /

UK / ɛnd /

A1
  • noun
  • The point where a process or activity stops
  • A point that marks the limit of something; finish
  • Goal or desired result
  • The tip, edge or limit of something
  • verb
  • To be the last part of something

loud

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US / laʊd /

UK / laʊd /

A2
  • adjecitve
  • Being very bright with colors, clothes etc.
  • Making a lot of noise

know

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US / nəʊ /

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mind

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england

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datum

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trust

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make

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attempt

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other

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how

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unfortunately

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creative

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perfect

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giant

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person

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you

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this

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birthday

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US / ˈbɜ:θdeɪ /

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five

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  • number
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ready

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statistical

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whoever

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alone

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identify

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three

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vary

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marvel

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into

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kind

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  • adjecitve
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happy

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phone

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than

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  • conjunction
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subscription

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also

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year

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big

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the

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below

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click

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pull

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  • noun
  • Act of breathing in smoke, as from a pipe
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multiple

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one

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US / wʌn /

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  • pronoun
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  • Introduction to Video Content
  • The Infamous, Brain-Bending Birthday ProblemHave you ever wondered what the odds are of having the same birthday as someone else? It turns out, the odds are much higher than many would guess. In fact, it only takes a group of twenty-three people for it to be probable that at least two of them will share a birthday. This may seem counterintuitive, considering there are three hundred and sixty-five possible birthdays in a year. However, the concept behind this phenomenon lies in probability.The Birthday Problem, also known as the Birthday Paradox, has been puzzling people for decades. It's named as such because it seems paradoxical that such a small group of people can produce a match. But the explanation is rooted in mathematical probability.To understand why it only takes twenty-three people for a birthday match to be more than fifty percent likely, let's delve into the concept of probabilities. Probability is a branch of mathematics that deals with the likelihood of events occurring. In this case, we are interested in the probability of two individuals having the same birthday within a given group.In a group of twenty-three people, there are a total of two hundred sixty-one possible pairs of individuals (23 choose 2). Each pair has roughly a one in three hundred and sixty-five chance of sharing a birthday. However, there are many pairs in the group, meaning the overall probability of any pair sharing a birthday increases.Think of it this way: when you have just one person, there is no one else to compare their birthday with, so the probability of a match is zero. Adding a second person increases the probability to one in three hundred and sixty-five. But with each additional person, the number of possible pairs also increases, drastically increasing the probability of at least one pair sharing a birthday.By the time you reach twenty-three people, the number of possible pairs has grown to two hundred sixty-one. This means that the probability of at least one pair sharing a birthday is now over fifty percent. In other words, it is more likely than not that two people in the group will have the same birthday.This concept is counterintuitive because our minds tend to think linearly rather than exponentially. We often underestimate the power of probability and the exponential growth in the number of pairs as the group size increases.The Birthday Problem has practical implications beyond just fun trivia. It has applications in fields such as cryptography, where understanding the probability of certain events is essential for creating secure systems. Additionally, it serves as a reminder of the complexities and surprises that can arise in the realm of mathematics.So the next time you find out you share a birthday with someone, remember that the odds of this happening are higher than you might think. And if you're ever in a group of twenty-three people, there's a good chance that at least two of them share the same special day.Thanks to Brilliant for supporting this video. Because you watch SciShow, Brilliant is offering you a thirty-day free trial and twenty percent off an annual premium subscription at Brilliant.org/SciShow.
  • Subtitles section
  • Thanks to Brilliant for supporting this video.
  • Because you watch SciShow, Brilliant is offering you a thirty day free trial and twenty percent off an annual premium subscription at Brilliant.org slash SciShow.
  • There's something so fun about finding out you have the same birthday as someone else.
  • It feels like a statistical marvel to hear that you and a buddy were born on the same day, and think of how much you can save on birthday cakes by going Dutch.
  • But have you ever wondered what those odds really are?
  • Like, how likely is it that you've got a birthday twin living on your street or working in your office?
  • As it turns out, the odds of two people having the same birthday are way higher than many would guess.
  • How about you?
  • How many people do you think need to gather for the odds of a birthday match to be better than fifty percent?
  • Comment below with your best guess now, and see if you got it right in just a sec!
  • Okay, comments in?
  • Good, here's the big reveal.
  • The number of people that you need for it to be probable that at least two of them will share a birthday is just twenty three.
  • I know, that sounds crazy.
  • With three hundred and sixty five possible birthdays in a year, surely you'd need way more people before you find a match.
  • And yes, for perfect one hundred percent odds of a match, you would need three hundred and sixty seven people.
  • But just twenty three people gives you more than a fifty percent chance of finding two people with the same birthday.
  • If your mind is blown right now, you're not alone.
  • This fact has been puzzling people for decades.
  • So much so, it's earned names like the Birthday Problem and even the Birthday Paradox.
  • So why does it take so few people to get a match?
  • The answer lies in probability.
  • When you think about the Birthday Problem, you might picture each person in the room just shouting their birthdays all at once.
  • That would be the equivalent of one big comparison of all twenty three dates.
  • It also would be pretty loud.
  • But to wrap your brain around this so called paradox, it's actually better to picture everyone in the room standing on their birthday on a giant calendar, one at a time.
  • The first person has a one hundred percent chance of standing on an empty date.
  • The second person has a three hundred and sixty four in three hundred and sixty five chance.
  • since only one box is occupied.
  • Which means the third person has a three hundred and sixty three in three hundred and sixty five chance, and so on.
  • By the time it's person twenty three's turn, they have a three hundred and forty three in three hundred and sixty five chance of standing in an empty box.
  • That still seems likely, but it's not the end of the story.
  • We can think of each person moving onto a box as a sort of pairwise comparison, with each pair having a one out of three hundred and sixty five odds of being a match.
  • Person A, the first onto the calendar, has nobody to compare themselves to, and Person B compares themselves to only Person A. Person C compares to both A and B, Person D compares to A, B, and C, and so on.
  • So, twenty three people is really two hundred and fifty three pairs of people, each of which has a one out of three hundred and sixty five odds of being a match.
  • And hey, listen, this is a lot of math to do, so we're just going to put it on screen and you can pause it if you want to look.
  • But please, trust us, if you do all of that multiplying, you are left with about fifty point seven percent odds of a match.
  • And it gets even more brain hurty as you add more people into the room, and those odds get higher.
  • With thirty two people, there's a seventy five percent chance of a match.
  • With forty one people, there's a ninety percent chance.
  • And when you have just seventy people in a room together, there's a ninety nine point nine percent chance that two of those people share a birthday.
  • Now, some of you may have been shouting at the screen about a slight flaw in this logic.
  • This problem assumes that any person has perfectly equal odds of their birthday being at any of the days on the calendar — that birthdays are randomly distributed.
  • But the real world is more complicated, and there are some factors that might alter the probability of a birthday match.
  • Obviously, we haven't taken into account any leap year birthdays.
  • Sorry to everyone out there born on February the third, but even if we did include you, it wouldn't change the odds all that much.
  • The bigger factor is that there isn't an even chance that people are born on any day of the year.
  • There are times of the year when more babies are born, and they vary around the world.
  • For example, in the U.S., the month with the most babies born is August, while in the U.K., it's July.
  • The most popular birthday in the U.S.
  • is September ninth, while in England and Wales, it's September twenty fifth.
  • But the best birthday is mine!
  • Which is a secret.
  • As interesting as all of these statistical calculations are, the birthday problem isn't just a fun fact that you can pull out at parties.
  • It has practical applications, too.
  • After all, birthdays aren't the only thing that can overlap.
  • Take medical studies, for example.
  • A lot of the time, data collected in studies is anonymized, meaning all identifying information, like names, birthdays, addresses, and phone numbers, is removed from the data.
  • This is done to protect people's safety and privacy.
  • If data isn't anonymized, then people's private health information may not be so private anymore.
  • Once you anonymize the data, there's no way of telling who participated in what studies, which is great for anyone in witness protection, which, hey, why are you answering surveys?
  • But this anonymized data can present its own kind of problem, double counting.
  • Let's say we want to find out how many people in Nebraska had a diagnosis of heart disease in a ten year span.
  • We could just ask each hospital in Nebraska for the number of patients they had with heart disease, then add them all up, and we'd get a solid number.
  • But we'd have no way of telling how many of those people had been to multiple hospitals and were in both hospitals' numbers.
  • They'd be double counted.
  • Thankfully, math based on the birthday problem can help us out here.
  • Using the same math of probabilities, researchers who are combining multiple datasets can find out the chances that someone is being counted twice and skewing their results.
  • Unfortunately, that doesn't mean we can pick out those double counts.
  • It's more to calculate the risk of overlaps and provide a margin of error around your study results.
  • Here's another example where the birthday problem can give us birthday solutions.
  • In computer science, data is kept secure by something called a hash function, which assigns each data point a new value called a hash value.
  • The problem is, every possible hash function can only produce a finite number of hash values, so sometimes two inputs will result in the same output value, which is called a collision.
  • And basically, if two data points have the same hash value, it means that a hacker can get the right results with the wrong answer.
  • It makes the whole dataset vulnerable to attacks.
  • Using the math behind the birthday problem, computer scientists can calculate the risk of collisions in their hash functions, which could help point at ways to minimize the chances of them happening.
  • In some commonly used methods, a hacker would need a thousand trillion attempts to cause a collision.
  • So what started as a quirky thought experiment ends up having real world applications.
  • And that, like any birthday, is something worth celebrating.
  • And in this video, we'd like to celebrate our sponsor, Brilliant.
  • Brilliant is an interactive online learning platform offering an ever growing catalog of lessons in math, science, and engineering, like their course in Creative Coding.
  • This course develops your programming skills with variables and loops in just eight lessons.
  • Then, you'll be ready to move on to one of Brilliant's seventeen other computer science courses.
  • So, one day soon, you could be one of those computer scientists protecting data against attacks with the Birthday Problem!
  • To get started with your first thirty days free, you can go to Brilliant.org slash SciShow, or click the link in the description down below.
  • That link also gives you twenty percent off an annual Premium Brilliant subscription.
  • Thanks to Brilliant for supporting this SciShow video, and happy birthday to whoever is watching this video on their special day!
  • Sound off in the comments so we can see the Birthday Problem in our own community.
  • That would be super cool.