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It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.