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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 60,000 miles of blood vessels in every adult human.
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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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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.