Brass doorknobs automatically disinfect themselves in about 8 hours.
18
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
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
9
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
For every gallon of sea water, you get more than a quarter pound of salt.
45
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
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