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Vaccines prevent between 2.5 and 4 million deaths every year.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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The horizontal fraction bar was introduced by the Arabs.
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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.