It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
In 2005, 25 percent of Americans over the age of 50 played video games, an increase from nine percent in 1999.
82
A hard working adult sweats up to 4 gallons per day.
39
The average bra size today is 36C. Ten years ago it was 34B.
266
Roughly a quarter of the world's people live in China.
50
Children's sense of smell is better than adults'.
860