Every workday, 6.7 million people commute to Manhattan!
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The “cheerleader effect”, the theory that girls look more attractive in groups, is scientifically proven.
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A study had men report their own penis size, and the average was found to be 6.1-6.5 inches. A subsequent clinical study actually measured penises, and found the average size to be 5.1-5.7 inches.
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Yawns are more contagious among people with closer relationships.
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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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Intelligent people have more zinc and copper in their hair.
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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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