A cesium atom in an atomic clock beats over nine billion times a second.
43
4.5 pounds of sunlight strike the Earth each day.
27
No matter how cold it gets, gasoline will not freeze.
107
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
Pure water (H2O) does not conduct electricity on its own.
46
One barrel of petroleum holds 42 gallons.
20
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51