Most dust particles in your house come from dead skin.
48
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
The bark of an older redwood tree is fireproof.
65
A cubic yard of air weighs about 2 pounds at sea level.
31
Pure water (H2O) does not conduct electricity on its own.
46
There are more than 270 people cryogenically frozen in the hope that one day the technology will exist that can revive them and extend their lives.
13