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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.