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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One in 500 humans has one blue eye and one brown eye.
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Roughly a quarter of the world's people live in China.
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Each year, around 24,000 Americans are bitten by rats!
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Thrity-five percent of the people who use personal ads for dating are already married.
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During your lifetime, you'll eat about 60,000 pounds of food, that's the weight of about 6 elephants!
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The average person laughs 13 times a day!
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