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The horizontal fraction bar was introduced by the Arabs.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.