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Why do we have crooked teeth when our ancestors didn’t? - G. Richard Scott

2,043,431 views

TED-Ed

Video Language:

  • English

Caption Language:

  • {{captionLanguage | language_name}} ({{captionLanguage}})

Accent:

  • English (US)

Speech Time:

88%
  • 4:41 / 5:16

Speech Rate:

  • 140 wpm - Conversational

Category:

  • Education

Tags :

Intro:

Video Vocabulary

strange
adjective

Unusual or odd; surprising because unexpected.

million

/ˈmilyən/

number

1,000,000.

milling

/ˈmiliNG/

adjective verb

(of machine) designed to cut metal using rotating tool. To grind into smaller pieces using a mill.

straight

/strāt/

adjective adverb noun

Not having curves, bends, or angles. in straight line. part of something that is not curved.

technologies

/tekˈnäləjē/

noun other

application of scientific knowledge for practical purposes. Of practical use of machines/sciences in industries.

subsistence

/səbˈsistəns/

noun

action or fact of maintaining or supporting oneself at minimal level.

complete

/kəmˈplēt/

adjective verb

having all necessary parts. To finish or reach the end of doing something.

usually

/ˈyo͞oZH(o͞o)əlē/

adverb

under normal conditions.

certainly

/ˈsərtnlē/

adverb

Sure; of course.

several

/ˈsev(ə)rəl/

adjective determiner pronoun

Many of. more than two but not many. More than two but not a large amount.

animals

/ˈanəməl/

noun other

living organism. Living creatures that are not plants or people.

dilemmas

/diˈlemə/

noun other

situation in which difficult choice has to be made between two or more alternatives. Positions in which you must make difficult choices.

tougher

/təf/

adjective

strong enough to withstand adverse conditions.

according

/əˈkôrdiNG/

adverb verb

as stated by. To give (someone) the respect due to them.

prepare

/prəˈper/

verb

To make something ready for use.

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