Iron weighs more after it rusts.
68
If the chemical sodium is dropped into water it will immediately and violently explode.
67
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
The smell of freshly cut grass is actually a plant distress call.
31