A cubic yard of air weighs about 2 pounds at sea level.
31
One third of the electricity produced on earth is used to power electric light bulbs!
75
Aluminum used to be more valuable than gold!
84
MIT has developed a camera that captures the speed of light at a trillion frames per second.
20
Sound travels fifteen times faster through steel than through air.
134
A cesium atom in an atomic clock beats over nine billion times a second.
43
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7