The average temperature at 40,000 feet above sea level is -60 F.
56
The bark of an older redwood tree is fireproof.
65
One barrel of petroleum holds 42 gallons.
20
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7
Iron weighs more after it rusts.
16
Nearly 50% of the world's scientists are assigned to military projects.
71
Most dust particles in your house are made from dead skin!
67