Yawns are more contagious among people with closer relationships.
163
The world's youngest parents were 8 and 9 and lived in China in 1910.
130
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
44% of kids watch television before they go to sleep.
106
Intelligent people have more zinc and copper in their hair.
233