Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Each day is longer than the previous on by 0.00000002 seconds which is 13 seconds each century!
116
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
A cubic yard of air weighs about 2 pounds at sea level.
31
Pumice is the only rock that floats on water.
14
Hot water can freeze faster than cold water.
181
The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
