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Author Question: How many ways can an arc be tangent to one line? To two lines? To a line and an arc? To two arcs? ... (Read 240 times) |
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.