The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.
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The human body produces and destroys 15 million blood cells every second.
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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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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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