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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
![Emanuel Leutze’s Washington Crossing the Delaware (1851) is riddled with historical inaccuracies, mo](https://biology-forums.com/gallery/47/medium_374628_16_08_15_9_46_08_22243215.jpeg)
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