In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
One barrel of petroleum holds 42 gallons.
20
If the chemical sodium is dropped into water it will immediately and violently explode.
67
In zero gravity, a candle's flame is round and blue.
16
In the 1950s, the US government placed beer next to an atomic bomb blast to determine if it was still drinkable. The result: in the event of a nuclear war, beer is safe to drink!
16
Pumice is the only rock that floats on water.
14