Hi, I'm new on the board but been reading since a long while. The end of the discussion in this particular thread: https://www.physicsforums.com/threads/extra-dimensions.838327/ has been enlightening (they're talking about pop-science vs real science). Since as far as I can remember I've been interested in physics and how the universe works. I watched countless documentaries about this subject and I always find there is something that cannot work. Now I get that there is "pop-science" and there is real science. And pop-science is all about being spectacular, not accurate nor complete. (quantum is not as weird as they say, membranes, multiverse and relativity are counter-intuitive, but not completely crackpot has they often depict them etc). So I plan in studying the real thing (in my spare time, by myself for now). My week spot is math. I have no problem with solving a formula (did calculus etc..) But I have difficulties transposing all this into a concrete thing in the real world. What should I begin with ?