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Author Question: ____________________________________________ ____________________________________________ are common ... (Read 37 times) |
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Cyanide works by making the human body unable to use oxygen.
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There are 20 feet of blood vessels in each square inch of human skin.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.