It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
More boys than girls are born during the day; more girls are born at night.
120
The “cheerleader effect”, the theory that girls look more attractive in groups, is scientifically proven.
8
Blonde hair is not exclusive to Europeans. Melanesians of the south Pacific evolved a different gene for blonde hair.
7
The world's youngest parents were 8 and 9 and lived in China in 1910.
130
Children grow faster in the springtime than any other season during the year.
108
2,500 newborn babies will be dropped in the next month.
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