Brass doorknobs automatically disinfect themselves in about 8 hours.
18
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
44
A 'jiffy' is an actual unit of time for 1/100th of a second!
66
The force of a suction cup is calculated using F=AP.
15
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
German chemists made a replica of a trophy the size of one molecule.
68
Most dust particles in your house come from dead skin.
48