I'm not positive that this is the appropriate Forum to post this thread in, but I trust that it will be moved if it needs to be. I've been thinking about the cornerstones of the different fields of Science. By "cornerstone", I mean a theory that is at the very heart of practically ever discovery made in the field, and that everyone in that field just obviously knows about. (Note: "cornerstone theories" are not what the field itself was founded on.) I've also been thinking about the people who came up with these grand theories (since they (the "founders" of these theories) are usually extremely well-known, not just by scientists, but by laymen also). I've come up with: Biology's cornerstone is Evolution. It's founder is Darwin. Everyone knows who Darwin is, and every Biologist must understand Evolution (btw, please correct me, if I get anything wrong in this post). Theoretical Physics has two cornerstones: Relativity and the Quantum Theory. The founder of Relativity (Einstein) is probably one of the most well-known historical figures in the world. Quantum theory doesn't really have a "founder", so to speak, but notable mentions would be Schrodinger and Heisenber. Every theoretical physicist must know the Quantum Theory and must know Relativity (even though the two happen to be (currently) incompatible). However, I can't think of any other "cornerstone" theories, for the other fields of science. Are there any others?