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The human body produces and destroys 15 million blood cells every second.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.
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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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The familiar sounds of your heart are made by the heart's valves as they open and close.