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Author Question: In a contest, two tractors pull two identical blocks of stone the same distance over identical ... (Read 5670 times) |
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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According to the CDC, approximately 31.7% of the U.S. population has high low-density lipoprotein (LDL) or "bad cholesterol" levels.