Vaccines prevent between 2.5 and 4 million deaths every year.
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A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.
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There are 20 feet of blood vessels in each square inch of human skin.
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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.
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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.
Reindeer standing on snow to avoid blood-sucking insects.