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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If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
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In 2005, 25 percent of Americans over the age of 50 played video games, an increase from nine percent in 1999.
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Humans blink over 10,000,000 times a year!
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Roughly a quarter of the world's people live in China.
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People are more likely to tilt their heads to the right when kissing instead of the left (65 percent of people go to the right!)
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