In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
In zero gravity, a candle's flame is round and blue.
16
Aluminum used to be more valuable than gold!
84
Indoor pollution is 10 times more toxic than outdoor pollution.
62
The earth is approx. 6,588,000,000,000,000,000 tons.
175
One 75-watt bulb gives more light than three 25-watt bulbs.
57
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3