When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
Most dust particles in your house come from dead skin.
48
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
Research indicates that plants grow healthier when they are stroked.
173