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If the universe is a simulation, what's to stop the simulation from recognizing that it's being tested and dedicating more resources to making the test result indicate that there is no simulation going on.

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That sounds a lot like a measurement having an effect. http://en.wikipedia.org/wiki/Wave_function_collapse

Isaac Asimov's 'The Last Question' answers that.

I feel stupid that I absolutely love this story but have no idea what you are you referring to.

Maybe we are a computer simulation but maybe we are the computer!

The Last Question is one of my most favorite short stories, and unless I'm completely missing something, has nothing to do with simulation.

Stanislaw Lem actually has a story precisely on this subject.

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