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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
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The average office desk has 400 times more bacteria on it than a toilet.
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There are 20 feet of blood vessels in each square inch of human skin.
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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.