Your brain is 80% water.
525
Iron weighs more after it rusts.
68
Pure water (H2O) does not conduct electricity on its own.
46
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
One barrel of petroleum holds 42 gallons.
20
Each day, up to 150 species of life become extinct.
-23
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5