Diamonds can be shattered with a hammer.
-104
4.5 pounds of sunlight strike the Earth each day.
27
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Pumice is the only rock that floats on water.
14
Nylon is made from coal and petroleum.
42
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75