One cubic foot of gold weighs more than 1,200 pounds!
78
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
The smell of freshly cut grass is actually a plant distress call.
31
Pure water (H2O) does not conduct electricity on its own.
46
One barrel of petroleum holds 42 gallons.
20
The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18