The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116
The average temperature at 40,000 feet above sea level is -60 F.
56
A cubic yard of air weighs about 2 pounds at sea level.
31
German chemists made a replica of a trophy the size of one molecule.
68
The banana plant cannot reproduce itself. It can be propagated only by the hand of man.
155
Nearly 50% of the world's scientists are assigned to military projects.
71
Iron weighs more after it rusts.
68