It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
The average sperm cell swims at 8 inches per hour.
4
You forget 90% of your dreams.
256
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
199
Our eyes are always the same size from birth, but our nose and ears never stop growing.
269
Research has determined that most people are happiest at 7:26pm on a Saturday night.
70
A human being loses an average of 40 to 100 strands of hair a day.
133
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197