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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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.