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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).