Apologies for the pun in the title. I'm curious to hear, from more experienced PFer's, on what the kind of satisfaction one can get from studying physics. More specifically, on whether the amount of uncertainty or unknown in a specific topic actually diminish with advances in understanding, or if each new understanding brings with it more than one new unknown. Speaking with a friend today who did physics with a concentration in electronics, he told me, "honestly, the more I learned the more I realized I didnt know anything about electronics". Is this a similar feeling for others, even those at the PhD level and on? Is it like exploring an unbounded territory, where the further you go simply extends the length of the border on the unknown? Or, is it possible to get to a place where you look back and say, yes, now I totally understand this arena, or subfield, topic, etc. The reason I ask is largely out of curiosity on what its like after being 10+ years in the physics field. In a lot of other fields, by that time you are basically a master at it.