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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90% of people sit at their computer desk slouching, supporting their head with their left hand.
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Half of all Americans over the age of 55 have no teeth.
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Only 2% of the Earth's population are natural redheads.
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Most people smile when they are frustrated, according to a study.
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