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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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The average older adult in the United States takes five prescription drugs per day. Half of these drugs contain a sedative. Alcohol should therefore be avoided by most senior citizens because of the dangerous interactions between alcohol and sedatives.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.