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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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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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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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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.