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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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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.
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The average adult has about 21 square feet of skin.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.