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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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Once thought to have neurofibromatosis, Joseph Merrick (also known as "the elephant man") is now, in retrospect, thought by clinical experts to have had Proteus syndrome. This endocrine disease causes continued and abnormal growth of the bones, muscles, skin, and so on and can become completely debilitating with severe deformities occurring anywhere on the body.

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Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.

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In 1844, Charles Goodyear obtained the first patent for a rubber condom.

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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.

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