In many countries, urine was used as a detergent for washing.
17
The harder you concentrate on falling asleep, the less likely you are to fall asleep.
34
There are 365 steps on the front of the U.S. Capitol Building - one for every day of the year.
50
Mentally doing a task makes you better at it. Your mind can barely tell the difference.
18
On average, 100 people choke to death on ballpoint pens every year.
72
An Australian study found that homework is of little to no academic value to students in elementary and junior high schools.
32
Playing Tetris after a traumatic event can prevent the development of traumatic memories and reduce the chance of having flashbacks.
30
In 21 U.S. states, WALMART is the single largest employer.
13