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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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The horizontal fraction bar was introduced by the Arabs.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.