A cubic yard of air weighs about 2 pounds at sea level.
31
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
Nylon is made from coal and petroleum.
42
The sun is 330,330 times larger than the earth.
75
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
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
Pumice is the only rock that floats on water.
14