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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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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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If you could remove all of your skin, it would weigh up to 5 pounds.
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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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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.