It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
Someone on Earth reports seeing a UFO every three minutes.
180
A hard working adult sweats up to 4 gallons per day.
39
Most people smile when they are frustrated, according to a study.
15
More boys than girls are born during the day; more girls are born at night.
120
Half of all Americans over the age of 55 have no teeth.
39