For every gallon of sea water, you get more than a quarter pound of salt.
45
One barrel of petroleum holds 42 gallons.
20
The bark of an older redwood tree is fireproof.
65
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
In zero gravity, a candle's flame is round and blue.
16
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
