Pumice is the only rock that floats on water.
14
Iron weighs more after it rusts.
68
Sound travels fifteen times faster through steel than through air.
134
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
The storage capacity of human brain exceeds 4 Terrabytes.
140
Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
16
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5