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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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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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Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.
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The longest a person has survived after a heart transplant is 24 years.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.