[goldenkey]

Same here. Now I do independent research (on primes) and am learning higher level mathematics myself by reading older edition textbooks. Mathematics is the best toolset to reason about reality. It's a shame that most people do not know or care to partake in it. It's the purest form of intrinsic truth there is in this universe.

[S_Daedalus]

I think it's also just useful to learn for the way it makes you stop and examine the world around you, your own decisions, in a new and more analytical light. Besides, if you're into physics, it's the only way; you can't visualize a 10-sphere.