Sleep
Birds do it, bees do it...yet science still can't answer the basic question: why do we sleep?Every creature on the planet sleeps--from giant humpback whales to teeny fruit flies. What does it do for...
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It's a dangerous world out there, with predators always lurking. So what on earth would give every single animal in the kingdom the gumption to think it could lay itself down each day, let down its...
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