Pumice is the only rock that floats on water.
14
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
Most dust particles in your house come from dead skin.
48
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
Indoor pollution is 10 times more toxic than outdoor pollution.
62
There are more atoms in one teaspoon of water than there are teaspoons of water in the Atlantic Ocean.
13