James Duncan Davidson/TED

What do we know about one of our most basic needs: sleep? Not a lot, says circadian neuroscientist Russell Foster. We know we need to do it to stay alive, but much about it remains a mystery.

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© Corbis

Brandeis Psychology professor Margie Lachman works in the same office where Abraham Maslow developed his hierarchy of needs. She describes his lasting influence on psychology.

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James Duncan Davidson/TED

Caroline Casey was 17 years old when she first learned she was visually impaired. Embracing her disability helped nourish her need for self-esteem.

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iStockphoto

Even as the use of traditional cigarettes and most other tobacco products dipped or stayed the same from 2013 to 2014, the use of e-cigarettes climbed among students in high school and middle school.

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The video-sharing website is now 10 years old. YouTube estimates that each day 432,000 hours of video gets posted on the service: a stunning record of our current civilization.

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