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Author Question: How can a lever system work at a mechanical disadvantage but still be of use to us? (Read 24 times) |
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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 Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.