In zero gravity, a candle's flame is round and blue.
16
One barrel of petroleum holds 42 gallons.
20
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
21
A 'jiffy' is an actual unit of time for 1/100th of a second!
66
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
The sun is 330,330 times larger than the earth.
75