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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
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There are 20 feet of blood vessels in each square inch of human skin.
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More than one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.