Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
One barrel of petroleum holds 42 gallons.
20
A cubic yard of air weighs about 2 pounds at sea level.
31
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
One third of the electricity produced on earth is used to power electric light bulbs!
75
Scientists in Germany have developed a candy that doesn't cause cavities.
11
Pure water (H2O) does not conduct electricity on its own.
46
Most dust particles in your house are made from dead skin!
67