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There are more bacteria in your mouth than there are people in the world.
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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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Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.
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There are 20 feet of blood vessels in each square inch of human skin.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.