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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The average American eats at McDonalds more than 1,800 times in their life.
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Nearly 10% of American households dress their pets in Halloween costumes.
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Awarding people money for doing well in IQ tests causes them to score better, $10 increased people's score by an average of more than 20 IQ points. IQ tests don’t just measure intelligence - they also measure effort.
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Each year, around 24,000 Americans are bitten by rats!
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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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