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    $\begingroup$ "Technological advancement would take a sizable hit with computers perhaps not being invented." <- why that? $\endgroup$ Commented Oct 15, 2014 at 15:04
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    $\begingroup$ @ScottDowney While Turing is often (rightly, for the most part) credited with inventing computers, he certainly didn't work alone, and even the great Turing built upon the shoulders of giants who came before him. Without him the Computer Age might have come a few short years later, but it still would have come. Worst-case scenario really is that the first iPhone were being introduced this year, rather than the sixth. $\endgroup$ Commented Oct 15, 2014 at 16:32
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    $\begingroup$ The first programmable computer was invented by Konrad Zuse in Germany. So I don't think there would have been much delay in computer technology without Alan Turing. But assuming World War II happened in the alternate world as well, him not decrypting the Enigma would certainly have had a great impact on that war. $\endgroup$ Commented Oct 15, 2014 at 20:21
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    $\begingroup$ Don't forget Charles Babbage and the Ancient Greeks in all of this! Although Turing pioneered in the field of Computer Science, he didn't invent the computer. $\endgroup$ Commented Oct 19, 2014 at 18:06
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    $\begingroup$ If WW2 didn't happen, Zuse might have found it easier to get funding and kicked off industrial computing solutions with his Z-series, which are rather interesting (more modern in some ways, alien in others). $\endgroup$ Commented Apr 3, 2015 at 17:51