The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116
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
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
One third of the electricity produced on earth is used to power electric light bulbs!
75
One 75-watt bulb gives more light than three 25-watt bulbs.
57
A cubic yard of air weighs about 2 pounds at sea level.
31