When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
One barrel of petroleum holds 42 gallons.
20
Aluminum used to be more valuable than gold!
84
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89