The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
Billions of neutrinos pass unnoticed through your body every second.
6
A cubic yard of air weighs about 2 pounds at sea level.
31
The average temperature at 40,000 feet above sea level is -60 F.
56
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7
Neanderthal man had a brain capacity 100cc larger than modern man's.
50