The human body has an internal circadian clock regulated by light — disrupting it increases risks of cancer, diabetes, and heart disease.
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People can survive significant blood loss with rapid treatment.
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Fingernails grow faster than toenails.
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The human body contains enough carbon to make roughly 9,000 pencils.
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The human eye can adapt to low-light conditions.
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People can survive weeks without food under certain conditions.
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The cornea of the eye has no blood vessels — it gets oxygen directly from the air.
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The human spine consists of 33 vertebrae.
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The human brain is optimized for pattern recognition.
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