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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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Vaccines prevent between 2.5 and 4 million deaths every year.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.