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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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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.