It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
2% of Europeans lack the genes for smelly armpits.
6
On average, a person will spend about five years eating during his or her lifetime.
90
Intelligent men tend to be more sexually faithful.
31
47% of people have a nightmare at least once a month.
186
Up to the age of six or seven months a child can breathe and swallow at the same time. An adult cannot do this.
165