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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Studies suggest that people who appear to be constantly distracted have more "working memory" and "sharper brains".
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The average single man is one inch shorter than the average married man.
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About 2/3 of American men prefer boxers to briefs.
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Dutch, on average are the tallest people.
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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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