I think one of the things I love most about biology is its uncertainty. Things like Math and engineering are all rigid and rules based. Life is wibbily wobbly, lifey-wifey. An enormous soup of changing alleles cast as probabilities over eons all creating endless interactions you can't ever comprehend.
You have to become comfortable with the fact that there is uncertainy and there are parts of it you can't control. So instead you have to be obsessed with introducing order where you can. It is so refreshing to see a beautiful experiment that can wrestle a clear signal from the endless noise.
> Things like Math and engineering are all rigid and rules based
Depends where in math, in things like particle physics things get all wibbly wobbly is my cat dead or alive. In things like engineering quite often what you're dealing with is probability based, but you just stack the deck so far in your favor the probability is 1.
As they say, building a bridge that doesn't fall down is easy. Building a bridge that barely doesn't fall down is much harder.