The average temperature at 40,000 feet above sea level is -60 F.
56
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
German chemists made a replica of a trophy the size of one molecule.
68
If the chemical sodium is dropped into water it will immediately and violently explode.
67
Sound travels fifteen times faster through steel than through air.
134
The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116