It's odd looking back at my undergraduate days and thinking, "Did I really learn and understand all that maths?" And I can't reconcile how intellectually hard it all was and how easy all the stuff that needs brain power is in post-university work.

But the flip side is that now I have to manage people, make decisions without the chance of ever having all the data I need, organize myself and others and track hundreds of little things for months at an end. Which, although it isn't Galois theory or Analysis III, is actually a lot tougher in some ways.