Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
16
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
Most dust particles in your house come from dead skin.
48
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
At 15 years old, Jack Andraka invented a method of diagnosing pancreatic cancer, thus helping to save the lives of millions of people around the world. It is 168 times faster, 26,000 times cheaper, 400 times more sensitive, and has a 99% success rate.
15
A cubic yard of air weighs about 2 pounds at sea level.
31