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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Men fall in love faster than women do.
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Only about 2% of the world population has green eyes.
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If you're over 100 years old, there's an 80% chance you're a woman.
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Blonde hair is not exclusive to Europeans. Melanesians of the south Pacific evolved a different gene for blonde hair.
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Roughly a quarter of the world's people live in China.
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The average woman uses her height in lipstick every 5 years.
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Most of the world's people must walk at least 3 hours to fetch water!
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