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Author Question: When you blow some air above the upper face of a paper strip, the paper rises. This occurs because ... (Read 43 times) |
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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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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Excessive alcohol use costs the country approximately $235 billion every year.