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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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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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There are more sensory neurons in the tongue than in any other part of the body.
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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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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.