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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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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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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.