Nearly 50% of the world's scientists are assigned to military projects.
71
Sound travels about 4 times faster in water than in air.
408
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
The only letter not appearing on the Periodic Table is the letter "J".
180
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
Nylon is made from coal and petroleum.
42