INFO:
Turns out that every living thing - men, women, animals, plants, insects, and algae - all have internal "body clocks" determined by a variety of biological rhythms. So why do we have these clocks, and what do they do for us?

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・This video 「

What the Stuff?!: 5 Weird Facts About Biological Rhythms | HowStuffWorks

」@howstuffworks.com
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