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The human body produces and destroys 15 million blood cells every second.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
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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 first documented use of surgical anesthesia in the United States was in Connecticut in 1844.