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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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Liver spots have nothing whatsoever to do with the liver. They are a type of freckles commonly seen in older adults who have been out in the sun without sufficient sunscreen.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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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.