Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
A cubic yard of air weighs about 2 pounds at sea level.
31
Nylon is made from coal and petroleum.
42
Scientists aren't sure what color dinosaurs were.
312
German chemists made a replica of a trophy the size of one molecule.
68
Research indicates that plants grow healthier when they are stroked.
173
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
Nuclear power prevented an average of over 1.8 million deaths between 1971-2009 as a result of lower air pollution from reduced coal usage according to NASA.
5