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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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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.
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Your heart beats over 36 million times a year.