Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Cold water weighs more than hot water.
93
A 'jiffy' is an actual unit of time for 1/100th of a second!
66
German chemists made a replica of a trophy the size of one molecule.
68
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
Indoor pollution is 10 times more toxic than outdoor pollution.
62
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5