Sound travels about 4 times faster in water than in air.
408
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7
The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
Indoor pollution is 10 times more toxic than outdoor pollution.
62
One cubic foot of gold weighs more than 1,200 pounds!
78