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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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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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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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Everyone has one nostril that is larger than the other.