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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The human body produces and destroys 15 million blood cells every second.
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The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
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The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.