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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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Green tea is able to stop the scent of garlic or onion from causing bad breath.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.
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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.