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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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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.
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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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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.