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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
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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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The average office desk has 400 times more bacteria on it than a toilet.
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Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.