A cubic yard of air weighs about 2 pounds at sea level.
31
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
Most liquid laundry detergents are alive with living organisms that help to break down stains!
88
The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7
Cold water weighs more than hot water.
93
