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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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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.
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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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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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On average, the stomach produces 2 L of hydrochloric acid per day.