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
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Intelligent people have more zinc and copper in their hair.
233
In 2005, 25 percent of Americans over the age of 50 played video games, an increase from nine percent in 1999.
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The first man to swim the length of Great Britain grew a beard to stop jellyfish stinging his face.
16
Babies crawl an average of 200m a day.
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Females learn to talk earlier, use sentences earlier, and learn to read more quickly than males.
119
It is estimated that at any one time, 0.7% of the world's population are drunk.
90