Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
The force of a suction cup is calculated using F=AP.
15
The earth is approx. 6,588,000,000,000,000,000 tons.
175
Most dust particles in your house come from dead skin.
48
Each day is longer than the previous on by 0.00000002 seconds which is 13 seconds each century!
116
Pure water (H2O) does not conduct electricity on its own.
46
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5