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The horizontal fraction bar was introduced by the Arabs.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
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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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On average, the stomach produces 2 L of hydrochloric acid per day.