Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
One third of the electricity produced on earth is used to power electric light bulbs!
75
One barrel of petroleum holds 42 gallons.
20
According to studies, men change their minds two to three times more often than women.
72
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
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