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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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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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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.