The force of a suction cup is calculated using F=AP.
15
Iron weighs more after it rusts.
68
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
The banana plant cannot reproduce itself. It can be propagated only by the hand of man.
155
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
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
A cesium atom in an atomic clock beats over nine billion times a second.
43