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The average office desk has 400 times more bacteria on it than a toilet.
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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.
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The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.
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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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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.