One in 500 humans has one blue eye and one brown eye.
145
Women rate men more attractive if other women are looking and smiling at him.
17
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
It is estimated that at any one time, 0.7% of the world's population are drunk.
90
Infants spend more time dreaming than adults do.
102
According to a study, women ages 22 to 30 with no children and no spouse earned a higher median income than comparable men in 39 of the 50 largest U.S. cities in 2008.
9
Two in five people in the world marry their first love.
270