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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.