Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Pumice is the only rock that floats on water.
14
Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
16
A cubic yard of air weighs about 2 pounds at sea level.
31
If you are locked in a completely sealed room, you will die of carbon dioxide poisoning first before you will die of oxygen deprivation.
117
Most dust particles in your house come from dead skin.
48
The average temperature at 40,000 feet above sea level is -60 F.
56
The earth is approx. 6,588,000,000,000,000,000 tons.
175