It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
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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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There are about 255 babies born worldwide every minute.
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The average single man is one inch shorter than the average married man.
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According to a study, women ages 22 to 30 with no children and no spouse earned a higher median income than comparable men in 39 of the 50 largest U.S. cities in 2008.
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