births
Robert J. Van de Graaff, American physicist and academic, invented the Van de Graaff generator (died 1967)
Related Wikipedia articles
Robert J. Van de Graaff
American physicist (1901–1967)
Robert Jemison Van de Graaff was an American physicist, noted for his design and construction of high-voltage Van de Graaff generators. He spent most of his career in the Massachusetts Institute of Technology (MIT).Source: Wikipedia (CC BY-SA)
Van de Graaff generator
Electrostatic generator operating on the triboelectric effect
A Van de Graaff generator is an electrostatic generator which uses a moving belt to accumulate electric charge on a hollow metal globe on the top of an insulated column, creating very high electric potentials. It produces very high voltage direct current (DC) electricity at low…Source: Wikipedia (CC BY-SA)
December 20
Day of the year
December 20 is the 354th day of the year in the Gregorian calendar; 11 days remain until the end of the year.Source: Wikipedia (CC BY-SA)