Only about 2% of the world population has green eyes.
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The world's youngest parents were 8 and 9 and lived in China in 1910.
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The world's tallest man reached 8 feet 11 inches at 21.
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Intelligent people have more zinc and copper in their hair.
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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.
9
About 3000 years ago, most Egyptians died by the time they were 30!
18
Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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