Physics deals with finding out the basic rules by which the universe works. For me, physics is the most fundamental understanding of the universe. So theoretically, everything could be explained by the laws of physics. Is there any field that deals with the idea? Similarly, chemistry is figuring out the rules by which matter around us behaves. I see chemistry as applied physics. Laws of chemistry could be explained by physics. But since there is too many things going on, we can't really explain it using laws of physics. So we don't approach studying chemistry by studying physics but we take a different approach. Which field deals with such ideas i.e. chemistry is applied physics, approach taken to study it etc. Similarly, there are other fundamental questions like following:- - Mathematics could be the language of universe i.e. maybe everything could be expressed as a number - Everything is built layer upon layer. Atoms, molecules are made up of more fundamental particles. Matter is made of atoms, molecules etc. Basically, physics -> chemistry -> biology -> psychology etc. I know these all are just ideas and not concrete statements but is there any field that studies this?