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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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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Drug-induced pharmacodynamic effects manifested in older adults include drug-induced renal toxicity, which can be a major factor when these adults are experiencing other kidney problems.
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The horizontal fraction bar was introduced by the Arabs.