The earth is approx. 6,588,000,000,000,000,000 tons.
175
German chemists made a replica of a trophy the size of one molecule.
68
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
Each day, up to 150 species of life become extinct.
-23
One barrel of petroleum holds 42 gallons.
20
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Scientists aren't sure what color dinosaurs were.
312