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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.