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Vaccines prevent between 2.5 and 4 million deaths every year.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.