Goosebumps are a vestigial reflex from when human ancestors had more body hair to keep them warm.
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The human nervous system can transmit signals faster than a Formula One car.
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The human brain contains about 86 billion neurons.
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Pacemakers help regulate abnormal heart rhythms.
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About 8% of people have an extra rib.
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The human body contains enough carbon to make about 9,000 pencils.
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Fingernails grow faster than toenails.
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Every hour, humans shed about 600,000 skin cells.
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The human brain contains billions of neurons involved in thinking.
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