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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.

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To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.

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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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