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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 longest a person has survived after a heart transplant is 24 years.
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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.