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There are more bacteria in your mouth than there are people in the world.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
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Aspirin may benefit 11 different cancers, including those of the colon, pancreas, lungs, prostate, breasts, and leukemia.