Cold water weighs more than hot water.
93
Iron weighs more after it rusts.
16
Sound travels fifteen times faster through steel than through air.
134
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
In 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
39
One barrel of petroleum holds 42 gallons.
20
If the chemical sodium is dropped into water it will immediately and violently explode.
67