Yawns are more contagious among people with closer relationships.
163
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 person will go on a date at least 100 times before they finally marry.
33
People with light eye colors (like blue, green or grey) have a higher alcohol tolerance.
194
Humans are capable of running 40 mph according to a study by bio-mechanical expert Dr. Matthew Bundle. Today's fastest man, Usain Bolt, has a top speed of 28 mph.
34
Every human spent about half an hour as a single cell.
144