[Accelerator isn't really bothered explaining the finer points of quantum mechanics. He knows it isn't typical for most people to be aware of the field outside a surface level understanding. Drilling down into it complicated and incorporates a lot of math - not exactly a popular subject with people - so he doesn't mind giving a non-mathematical rundown.

He might not be able to start a fire without his ability, but he can sure explain the nature of particles smaller than atoms!]

It was created by a German physicist, Werner Heisenberg. Basically, there's a limit to the precision at which you can measure certain pairs of physical properties simultaneously. For example, if you're trying to measure position and momentum of a photon, the more accurate you are in measuring the photon's position, the less accurate you're going to be when you're measuring its momentum. It'll say, be fifty percent and fifty percent, or sixty-forty. [He shrugs.] This is a fundamental aspect of quantum mechanics, and I can just ignore it. Normal reality might measure the photon at fifty-fifty, but my Personal Reality can ignore that and make it one hundred-zero. That influence on the micro scale then has observable effects on the macro scale, like a pyrokinetic esper shooting a fireball.

[It's simple, really!]