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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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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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Asthma cases in Americans are about 75% higher today than they were in 1980.
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During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.