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Author Question: In a contest, two tractors pull two identical blocks of stone the same distance over identical ... (Read 2076 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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).
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Vaccines prevent between 2.5 and 4 million deaths every year.