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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.
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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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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.