Do waves and/or particles exist at all??? This question may come out of some ignorance on my part, but I was reading the Feynman Lectures on Physics and it said that saying that light is both a wave and a particle is synonymous with saying that it is really neither one; BUT my textbook said that particles with mass are also waves, which would seem to imply that "particles" with mass are also neither a wave nor a particle. Which begs the question, Does our conception of a particle exist in nature at all? Likewise, Does our conception of a wave exist in nature at all? Or is everything made out of fundamental quasi-wave quasi-particle stuff that we can't really observe? Although I suppose we can observe this "stuff" in the sense that we can say that part of its nature is that it cannot be observed in a traditional, classical way.