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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You share your birthday with at least 9 other million people in the world.
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Every workday, 6.7 million people commute to Manhattan!
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The typical person spends about 600 hours having sex between the ages of 20 and 70.
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Approximately one-third of the population can't snap their fingers!
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Roughly a quarter of the world's people live in China.
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