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Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
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It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.
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There are 20 feet of blood vessels in each square inch of human skin.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.