At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
If the chemical sodium is dropped into water it will immediately and violently explode.
67
Hot water can freeze faster than cold water.
181
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Nylon is made from coal and petroleum.
42
The average home creates more pollution than does the average car.
33