We are only just at the start, the problem is the subatomic level and quantum as quantum acts very differently, Einstein had problems with this and could not come to terms with it, every theory has to be put out there then it goes via rigorous process of proof and mathematics to test the theory, but if we close our minds we do not advance, see the film about INFINITY, where a young asian student upset the established order in Oxford during the first world war. the problem is we don't have the technology yet to see the quantum world but that does not mean it's not there. The next stage is to fit everything into the answer in one grand unification theory which has not been fully adopted as the standard theory due so many holes, between all theories if we test will find a model that does answer the question and some theories will not stack up and be rejected, but should not all be saying the world is flat and that's it. Besides this everyone knows the answer is 42