[ QUOTE ]
In terms of impact on the world at large, I don't really see that evolution and quantum mechanics have any real competition, and the impact of quantum mechanics is indirect, so I'd vote for evolution.

[/ QUOTE ]
I will debate you a bit, here. Evolution does not change the way biology gets done in a biology lab (unless you study evolution, or perhaps if you specifically look at mutation rates of pathogens). On the other hand, quantum mechanics is an absolute requirement in solid state physics, which is directly responsible for the communication/computation revolution. The impact on your life and, in fact, a huge fraction of our modern economy, could not be more direct.