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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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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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The senior population grows every year. Seniors older than 65 years of age now comprise more than 13% of the total population. However, women outlive men. In the 85-and-over age group, there are only 45 men to every 100 women.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.