Nearly 50% of the world's scientists are assigned to military projects.
71
One barrel of petroleum holds 42 gallons.
20
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
One ragweed plant can release as many as one billion grains of pollen!
51
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
No matter how cold it gets, gasoline will not freeze.
107
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118