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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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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.

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It is difficult to obtain enough calcium without consuming milk or other dairy foods.

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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.

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