One cubic foot of gold weighs more than 1,200 pounds!
78
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
The force of a suction cup is calculated using F=AP.
15
There are more than 270 people cryogenically frozen in the hope that one day the technology will exist that can revive them and extend their lives.
13