Sound travels fifteen times faster through steel than through air.
134
Iron weighs more after it rusts.
68
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
For every gallon of sea water, you get more than a quarter pound of salt.
45
Oak trees produce 2,200 acorns in a season, but each acorn only has a 1 in 10,000 chance of becoming an oak tree.
304
Balsa wood is classified as a hard wood!
41
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79