There's an isolated tribe in Zimbabwe where the people have only two toes, dubbed the 'ostrich people'.
10
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 is estimated that at any one time, 0.7% of the world's population are drunk.
90
One in 500 humans has one blue eye and one brown eye.
145
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Two in five people in the world marry their first love.
270
A person swallows approximately 295 times while eating dinner.
63
