It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Research has determined that most people are happiest at 7:26pm on a Saturday night.
69
In one day an average person will take about 18,000 steps.
55
The first man to swim the length of Great Britain grew a beard to stop jellyfish stinging his face.
16
Half of all Americans over the age of 55 have no teeth.
39
All babies are color blind when they are born.
114
One million Americans, about 3,000 each day, take up smoking each year. Most of them are children.
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