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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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The horizontal fraction bar was introduced by the Arabs.
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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.
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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.