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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.