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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About 2/3 of American men prefer boxers to briefs.
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Boys who have unusual first names are more likely to have mental problems than boys with conventional names. Girls don't seem to have this problem.
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Americans did not commonly use forks until after the Civil War.
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People with light eye colors (like blue, green or grey) have a higher alcohol tolerance.
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According to Harris Interactive, 70% of men and 57% of women shower daily.
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Men are more attracted to women whose bone structure is similar to their own mothers. It's called "sexual imprinting".
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The offspring of two sets of identical twins are legally cousins but genetically siblings.
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