Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
A cesium atom in an atomic clock beats over nine billion times a second.
43
Cold water weighs more than hot water.
93
If the chemical sodium is dropped into water it will immediately and violently explode.
67
In the 60s, a scientist gave LSD to dolphins in an attempt to teach them English.
17