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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.
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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 heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.