A cubic yard of air weighs about 2 pounds at sea level.
31
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
The gas that gives rotten eggs their distinctive foul smell may slow ageing and block damaging chemical reactions inside cells, according to scientists in China.
5
In 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
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
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
Nylon is made from coal and petroleum.
42