In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
In zero gravity, a candle's flame is round and blue.
16
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
Columbia University has developed an artificial tree that passively soaks up carbon dioxide from the air using "leaves" that are 1,000 times more efficient than true leaves that use photosynthesis.
15
Pure water (H2O) does not conduct electricity on its own.
46
During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
21
A single speck of dust is half way in size between a subatomic particle and the Earth.
15