Iron weighs more after it rusts.
68
Your brain is 80% water.
525
Sound travels about 4 times faster in water than in air.
408
The sun is 330,330 times larger than the earth.
75
Nylon is made from coal and petroleum.
42
German chemists made a replica of a trophy the size of one molecule.
68
A cubic yard of air weighs about 2 pounds at sea level.
31
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55