When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
The average temperature at 40,000 feet above sea level is -60 F.
56
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
Sound at the right vibration can bore holes through a solid object.
134
Indoor pollution is 10 times more toxic than outdoor pollution.
62
Nearly 50% of the world's scientists are assigned to military projects.
71
The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
