When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
A cubic yard of air weighs about 2 pounds at sea level.
31
One ragweed plant can release as many as one billion grains of pollen!
51
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7
Out of all the senses, smell is most closely linked to memory.
146
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
Scientists in Germany have developed a candy that doesn't cause cavities.
11