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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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The average adult has about 21 square feet of skin.