The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116
During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
21
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
No matter how cold it gets, gasoline will not freeze.
107
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
The average temperature at 40,000 feet above sea level is -60 F.
56
The average home creates more pollution than does the average car.
33
A cubic yard of air weighs about 2 pounds at sea level.
31