Brass doorknobs automatically disinfect themselves in about 8 hours.
18
There are more atoms in one teaspoon of water than there are teaspoons of water in the Atlantic Ocean.
13
Iron weighs more after it rusts.
68
A ball of glass will bounce higher than a ball made of rubber.
73
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
One barrel of petroleum holds 42 gallons.
20