When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
The average temperature at 40,000 feet above sea level is -60 F.
56
Each day, up to 150 species of life become extinct.
-23
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
According to studies, men change their minds two to three times more often than women.
72
Liquid TIDE laundry detergent glows under a blacklight.
96