Your brain is 80% water.
525
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Iron weighs more after it rusts.
68
One gallon of used motor oil can ruin approximately one million gallons of fresh water!
71
The average temperature at 40,000 feet above sea level is -60 F.
56
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Sound travels about 4 times faster in water than in air.
408