Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
Most dust particles in your house are made from dead skin!
67
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
The average temperature at 40,000 feet above sea level is -60 F.
56
Aluminum used to be more valuable than gold!
84
There are more atoms in one teaspoon of water than there are teaspoons of water in the Atlantic Ocean.
13
Your brain is 80% water.
525