So I have noticed something about myself that is quite strange and I cannot fully understand and I was wondering if it happened to anyone else. When I first study material from a course (Mostly Physics because it's my major, but it applies to anything.) I can do it but it takes a lot of studying (as any science does.) What is weird that, if I come back to the materials (Say at the end of the semester for the final, which I am doing right now) the problems seem WAY easier! Even though I have done NO work in them for months. An EXCELLENT example is the following. In my optics class, the first half of the semester was geometrical optics and the second was Physical optics. These are two TOTALLY different theories and their problems (referring to the problem sets at the end of the chapter) do NOT relate to each other in the slightest. Well it has been months since I have touched this stuff and it is WAY easier than it was when I first studied it at the beginning of the semester! It is very strange that problems that I was once bogged down on and never was able to complete I am doing with no problem now! This has happened to me before in other courses but I always blamed it on reviewing the material over the semester since it was all cumulative. Well geometrical optics is nothing like physical optics and I am thrown for a loop! I feel like my brain needs a "break in" period to better do these problems after learning something as this seems to happen every semester. Maybe my brain is at a "higher level" than it was at the beginning of the semester due to all the studying and work? I do not know! Anyone else experience this? I find it to be very strange especially for this optics example.