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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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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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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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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.