Hi, Not totally top notch on physics- I just studied it till in school till I was 18. I am aware, however, that there is some sort of incommensurability of the two main strands of theoretical physics- quantum and relativity. Could someone please tell me what that is? And more to the point, for my purposes, are there any actual experimental consequences of this incompatibility? Does one work in some circumstances and the other not? Or do they both fit the data in all cases, and the incompatibility is really just ontological? I would really appreciate some help on this.