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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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The first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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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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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.