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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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More than 4.4billion prescriptions were dispensed within the United States in 2016.
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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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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

