It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Only about 2% of the world population has green eyes.
36
There are two credit cards for every person in the United States.
2
Children's sense of smell is better than adults'.
860
A person swallows approximately 295 times while eating dinner.
63
Infants spend more time dreaming than adults do.
102
Research has determined that most people are happiest at 7:26pm on a Saturday night.
69
In a year, the average person walks four miles to make his or her bed.
56