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There are more nerve cells in one human brain than there are stars in the Milky Way.
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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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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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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.