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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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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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There are more nerve cells in one human brain than there are stars in the Milky Way.