Only about 2% of the world population has green eyes.
36
Only 2% of the Earth's population are natural redheads.
13
Only 2% of the worlds population is blonde.
15
Yawns are more contagious among people with closer relationships.
163
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
According to the American Society for Microbiology, 90% of women and 75% of men wash their hands after using a public restroom.
170
More than half the population of Kenya is under the age of 15.
71