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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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The human body produces and destroys 15 million blood cells every second.
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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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If you could remove all of your skin, it would weigh up to 5 pounds.
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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.