Iron weighs more after it rusts.
16
Nylon is made from coal and petroleum.
42
One cubic foot of gold weighs more than 1,200 pounds!
78
Balsa wood is classified as a hard wood!
41
Scientists have developed a microparticle filled with oxygen that can be injected into the blood stream, enabling us to live without breathing.
21
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Each day, up to 150 species of life become extinct.
-23
Brass doorknobs automatically disinfect themselves in about 8 hours.
18