When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
Liquid TIDE laundry detergent glows under a blacklight.
96
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
The earth is approx. 6,588,000,000,000,000,000 tons.
175
No matter how cold it gets, gasoline will not freeze.
107
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61