In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
The banana plant cannot reproduce itself. It can be propagated only by the hand of man.
155
The average temperature at 40,000 feet above sea level is -60 F.
56
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108