Sound travels fifteen times faster through steel than through air.
134
Most dust particles in your house come from dead skin.
48
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
One gallon of used motor oil can ruin approximately one million gallons of fresh water!
71
Neanderthal man had a brain capacity 100cc larger than modern man's.
50
One ragweed plant can release as many as one billion grains of pollen!
51
Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
9
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199