Yawns are more contagious among people with closer relationships.
163
As many as one third Americans flush the toilet while they are still on it.
157
Children laugh about 400 times a day, while adults laugh on average only 15 times a day.
973
Someone on Earth reports seeing a UFO every three minutes.
180
Women mature much faster than men.
1k
Only about 2% of the world population has green eyes.
36