Nylon is made from coal and petroleum.
42
Iron weighs more after it rusts.
68
Nearly 50% of the world's scientists are assigned to military projects.
71
Each day, up to 150 species of life become extinct.
-23
In zero gravity, a candle's flame is round and blue.
16
A cesium atom in an atomic clock beats over nine billion times a second.
43
Sound at the right vibration can bore holes through a solid object.
134