Sound travels fifteen times faster through steel than through air.
134
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
Scientists aren't sure what color dinosaurs were.
312
Most dust particles in your house come from dead skin.
48
Balsa wood is classified as a hard wood!
41
Hot water can freeze faster than cold water.
181
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108