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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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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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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
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Vaccines prevent between 2.5 and 4 million deaths every year.