If the chemical sodium is dropped into water it will immediately and violently explode.
67
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Iron weighs more after it rusts.
68
Scientists concluded that the chicken came first, not the egg, because the protein which makes the egg shells is only produced by hens.
11
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
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
A ball of glass will bounce higher than a ball made of rubber.
73
Brass doorknobs automatically disinfect themselves in about 8 hours.
18