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The average adult has about 21 square feet of skin.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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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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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.