It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Women have a slightly higher average IQ than men.
164
Research has determined that most people are happiest at 7:26pm on a Saturday night.
69
Only about 2% of the world population has green eyes.
36
The name "Wendy" was made up for the book Peter Pan!
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