Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Balsa wood is classified as a hard wood!
41
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Diamonds can be shattered with a hammer.
-104
Columbia University has developed an artificial tree that passively soaks up carbon dioxide from the air using "leaves" that are 1,000 times more efficient than true leaves that use photosynthesis.
15
Some toothpastes and deodorants contain the same chemicals found in antifreeze.
38
The force of a suction cup is calculated using F=AP.
15
The left ear is more responsive to words of love and emotion whispered into it than the right.
40