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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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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.