Variable Man (Version 2)
Author: first_name: Philip K.
last_name: Dick
Language: English
Year: 0

Philip K. Dick wrote some great Science Fiction and here is an example.  Published in 1953, in Space Science Fiction, t his story explores an earth that is rigidly bound both by centuries of single minded focus on war, and on what happens when humans have learned to depend entirely on a mechanical calculator/computer to tell them what to do.  There is no room for a factor outside known factors, something to throw all calculations off.  A man from the past.   He fixed things—clocks, refrigerators