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The familiar sounds of your heart are made by the heart's valves as they open and close.
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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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According to animal studies, the typical American diet is damaging to the liver and may result in allergies, low energy, digestive problems, and a lack of ability to detoxify harmful substances.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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There are more bacteria in your mouth than there are people in the world.