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Scott Aaronson
theoretical computer scientist at the Institute for Quantum Computing University of Waterloo, Canada

The greatest innovation in computer science was to represent machines - objects that do things, respond to their environments, surprise their creators - as nothing but strings of information. When I was a kid, my overriding ambition was to write my own Nintendo games. But while I could draw the characters and the levels, I had no idea what it would be like to breathe life into a game - to teach the game how to respond to the controller. I pictured thousands of engineers in white lab coats crafting a game cartridge using enormous factory equipment, as they would a 747.

Then a friend showed me a rudimentary spaceship game written in AppleBASIC. Look: here were the lines of code, and here was the game. Slowly it dawned on me that these screenfuls of funny-looking commands weren’t just some sort of blueprint for the game – they were the game. Change the code, and the game would do something different. Better yet, the task of writing the commands was ultimately just a big math problem. This was Alan Turing’s great insight of 1936. For me, it was a revelation comparable only to finding out where babies came from.

Scott Aaronson is a theoretical computer scientist at the Institute for Quantum Computing University of Waterloo, Canada, blogger and creator of the Complexity Zoo