Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Nuclear power prevented an average of over 1.8 million deaths between 1971-2009 as a result of lower air pollution from reduced coal usage according to NASA.
5
Balsa wood is classified as a hard wood!
41
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
For every gallon of sea water, you get more than a quarter pound of salt.
45
Research indicates that plants grow healthier when they are stroked.
173
The bark of an older redwood tree is fireproof.
65
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118