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
Cold water weighs more than hot water.
93
Iron weighs more after it rusts.
16
The bark of an older redwood tree is fireproof.
65
Indoor pollution is 10 times more toxic than outdoor pollution.
62
Sound travels about 4 times faster in water than in air.
408
Pumice is the only rock that floats on water.
14