Our natural sleep cycle

In today’s world, balancing school, work, kids and more, most of us can only hope for the recommended eight hours of sleep. Examining the science behind our body’s internal clock, Jessa Gamble reveals the surprising and substantial program of rest we should be observing.

Quiz: Name all the two-celled organisms!


  1. #1 Lynn Wilhelm
    September 22, 2010

    Uh. None.
    Was that a picture of a horseshoe crab?
    Interesting info, but only touched on the subject.
    I have a friend doing a TED talk shortly. On urban chickens.