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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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There are 20 feet of blood vessels in each square inch of human skin.
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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.
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The longest a person has survived after a heart transplant is 24 years.
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Your chance of developing a kidney stone is 1 in 10. In recent years, approximately 3.7 million people in the United States were diagnosed with a kidney disease.