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1943 – 1944: Two professors from the University of Pennsylvania, John Mauchly and J. Presper Eckert, built the Electronic Numerical Integrator and Calculator (ENIAC). Considered the “grandfather” of modern digital computers, its massive body occupies a room with an area of 6x12m, consisting of 40 shelves of 2.4 meters high and 18,000 vacuum tubes. It is capable of processing 5,000 operations per second and works faster than any previous device. Joey doesn’t share food phone case. 1946: Mauchly and Presper leave the University of Pennsylvania and receive funding from the Census Bureau to build the UNIVAC, the first commercial computer for business and government applications. 1947: William Shockley, John Bardeen and Walter Brattain of Bell Laboratories (Bell Laboratories) invented the transistor. They have discovered how to make an electrical switch with solid materials and without a vacuum.