The offspring of two sets of identical twins are legally cousins but genetically siblings.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Over 98 percent of Japanese people are cremated after they die.
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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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Most people smile when they are frustrated, according to a study.
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