When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
The only letter not appearing on the Periodic Table is the letter "J".
180
Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
9
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
A cubic yard of air weighs about 2 pounds at sea level.
31
A cesium atom in an atomic clock beats over nine billion times a second.
43
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65