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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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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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Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.