@JerraT you have to read his quote as a bit artful, rather than taking it ultra-literally. Try to understand what quantum mechanics says is and isn't the case about the things we call "electrons" and then read his quote again. I think a charitable reading of what he's saying is, "the things we call electrons don't exist in the way we usually think of, as distinct classical objects that bounce around like little balls in the world". When we interact with an electron in a way that makes it seem like we've interacted with a little ball, QFT is saying something more subtle has happened than that
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