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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.