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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Women are 50% to 75% more likely than men to experience an adverse drug reaction.
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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.