There are sounds too low or high for humans to ever hear.
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The human eye adapts to darkness by increasing light sensitivity.
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Polar bears have black skin beneath their white fur.
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Some snakes shed their skin multiple times a year.
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The human brain weighs about three pounds on average.
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There are more possible shuffles of a deck of cards than seconds since Earth formed.
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Some animals can regenerate entire body parts.
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The longest winning streak in professional sports can span years.
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The human body contains trillions of cells.
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