Brass doorknobs automatically disinfect themselves in about 8 hours.
18
Pumice is the only rock that floats on water.
14
Diamonds can be shattered with a hammer.
-104
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
One barrel of petroleum holds 42 gallons.
20
Aluminum used to be more valuable than gold!
84
No matter how cold it gets, gasoline will not freeze.
107
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3