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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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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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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 horizontal fraction bar was introduced by the Arabs.