In zero gravity, a candle's flame is round and blue.
16
Aluminum used to be more valuable than gold!
84
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
One ragweed plant can release as many as one billion grains of pollen!
51
Scientists in Germany have developed a candy that doesn't cause cavities.
11
Rafflesia Arnoldii is the largest flower in the world and can grow as big as an umbrella.
42