In zero gravity, a candle's flame is round and blue.
16
A cubic yard of air weighs about 2 pounds at sea level.
31
Diamonds can be shattered with a hammer.
-104
Some toothpastes and deodorants contain the same chemicals found in antifreeze.
38
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
A cesium atom in an atomic clock beats over nine billion times a second.
43
Iron weighs more after it rusts.
68