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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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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.

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The familiar sounds of your heart are made by the heart's valves as they open and close.

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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

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Everyone has one nostril that is larger than the other.

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