Blood makes up about 7 to 8 percent of your total body weight.
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The brain begins to suffer damage after about 5 minutes without oxygen.
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Your brain fills in your blind spot so you never see it.
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Your brain enables thought.
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Goosebumps are a vestigial reflex — in our hairier ancestors, they made fur stand up to appear larger or stay warm.
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Your brain interprets input.
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About 8% of people have an extra rib.
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There are people alive today whose hearts have stopped for hours and were restarted.
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The human body contains enough carbon to make thousands of pencils.
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