The adrenal glands sit atop the kidneys and produce cortisol, adrenaline, and sex hormones.
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The human eye has a natural blind spot.
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Your small intestine is about 20 feet long — about four times your height.
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The human body produces heat through metabolism.
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The human body can survive hours in freezing water in rare cases.
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Your heart creates enough pressure to squirt blood several feet.
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Less than 1% of people have heterochromia, where eyes are different colors.
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Your brain can recognize a familiar face in less than half a second.
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About 1 in 2,000 people are born with an extra finger or toe.
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