A cubic yard of air weighs about 2 pounds at sea level.
31
One 75-watt bulb gives more light than three 25-watt bulbs.
57
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
The earth is approx. 6,588,000,000,000,000,000 tons.
175
Nylon is made from coal and petroleum.
42