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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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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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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.