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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.

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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.

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On average, the stomach produces 2 L of hydrochloric acid per day.

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

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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

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