Most dust particles in your house come from dead skin.
48
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Scientists concluded that the chicken came first, not the egg, because the protein which makes the egg shells is only produced by hens.
11
One cubic foot of gold weighs more than 1,200 pounds!
78