The earth is approx. 6,588,000,000,000,000,000 tons.
175
Indoor pollution is 10 times more toxic than outdoor pollution.
62
Your brain is 80% water.
525
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
In zero gravity, a candle's flame is round and blue.
16
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
Scientists in Germany have developed a candy that doesn't cause cavities.
11