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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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The horizontal fraction bar was introduced by the Arabs.
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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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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.