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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.

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Green tea is able to stop the scent of garlic or onion from causing bad breath.

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The most dangerous mercury compound, dimethyl mercury, is so toxic that even a few microliters spilled on the skin can cause death. Mercury has been shown to accumulate in higher amounts in the following types of fish than other types: swordfish, shark, mackerel, tilefish, crab, and tuna.

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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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