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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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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.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.