In zero gravity, a candle's flame is round and blue.
16
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
9
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
Research indicates that plants grow healthier when they are stroked.
173
Diamonds can be shattered with a hammer.
-104
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39