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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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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.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.