Humans have a residual diving reflex — heart rate slows and blood is redirected to vital organs when the face is submerged in cold water.
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The human brain contains billions of neurons involved in thinking.
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Your brain can store the equivalent of millions of gigabytes of information.
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Your corneas receive no blood supply — they get oxygen directly from the air.
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The human eye can detect a candle flame over a mile away in darkness.
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An African elephant's ears help regulate its body temperature.
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