An individual blood cell takes about 60 seconds to complete a full circuit of the body.
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Humans can survive weeks with minimal calories.
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Your brain generates signals.
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The human body produces red blood cells in bone marrow.
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The human body contains enough carbon to make roughly 9,000 pencils.
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The human body contains enough carbon to make thousands of pencils.
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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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More than half of all humans ever lived died before age 10.
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Your nose can detect over 1 trillion different scents.
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