The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Balsa wood is classified as a hard wood!
41
Sound travels fifteen times faster through steel than through air.
134
If the chemical sodium is dropped into water it will immediately and violently explode.
67
MIT has developed a camera that captures the speed of light at a trillion frames per second.
20
For every gallon of sea water, you get more than a quarter pound of salt.
45
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
The left ear is more responsive to words of love and emotion whispered into it than the right.
40