There are actually seven different types of twins: Identical, Fraternal, Mirror-Image, Polar Body (Half Identical), Mixed Chromosome, Superfecundation, and Superfetation.
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About 2/3 of American men prefer boxers to briefs.
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Most people smile when they are frustrated, according to a study.
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The world's tallest man reached 8 feet 11 inches at 21.
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People who have a strong friendship possess the ability to communicate with one another through facial expressions.
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A hard working adult sweats up to 4 gallons per day.
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