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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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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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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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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.