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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Colchicine is a highly poisonous alkaloid originally extracted from a type of saffron plant that is used mainly to treat gout.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.