Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
Most dust particles in your house come from dead skin.
48
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Dr.Jonas Salk, the man who came up with the cure for polio, didn’t patent the drug. This made the drug more affordable to the general public, and he lost out an an estimated $7 billion dollars for himself.
41
Each day, up to 150 species of life become extinct.
-23
A cubic yard of air weighs about 2 pounds at sea level.
31