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Vacuum Tubes
John Ambrose Fleming invented the vacuum tubes -
1st Electronic Digital Computer
John Vincent Atanasoff invented the first electronic digital computer -
First Programmable Computer
Konrad Zuse invented the first Programmable Computer -
Transistors
William Shockley, Walter Houser, John Bardeen all invented Transistors -
1st Automatic Computing Engines
Alan Turing invented the first automatic computing engine -
Artificial Intelligence
John McCarthy invented Artificial Intelligence -
Integrated Circuits
William Shockley, Walter Houser, John Bardeen all invented Integrated Circuits -
Computer Mouse
Douglas Engelbert, Rene Sommer both invented the computer mouse -
Microprocessors
Marcian Hoff, Masatoshi Shima, Stanzley Mazor, Federico Faggin all invented Microprocessors -
The world wide web
Tim Berners-Lee, Robert Cailliau invented the world wide web -
iPhone
Steve Jobs invented the iPhone -
Reflection
The most important thing in computer history would have to be the first automatic computer engine because it make computing way easier.