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Asthma cases in Americans are about 75% higher today than they were in 1980.

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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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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.

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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.

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Vaccines prevent between 2.5 and 4 million deaths every year.

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