Tinnitus (ringing in the ears) affects 15% of adults — and is caused by damage to cochlear hair cells.
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More than half of all humans ever lived died before age 10.
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The body can compensate for many injuries temporarily.
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The average human body contains about 37 trillion cells.
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Teeth are the only part of the human body that cannot repair themselves.
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The human liver can regenerate lost tissue.
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The human body can survive hours in freezing water in rare cases.
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The human brain consumes roughly the same power as a small light bulb.
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The human nervous system can send signals at over 200 miles per hour.
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