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There are 20 feet of blood vessels in each square inch of human skin.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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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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People often find it difficult to accept the idea that bacteria can be beneficial and improve health. Lactic acid bacteria are good, and when eaten, these bacteria improve health and increase longevity. These bacteria included in foods such as yogurt.
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In 1864, the first barbiturate (barbituric acid) was synthesized.