https://en.wikipedia.org/wiki/List_of_unsolved_problems_in_physics

I just today conceptually understood why quantum gravity is a perplexity. I knew the problem existed, but with a very limited mathematical background, did not really get it. I rely on conceptual understanding to comprehend the world around me and the problems of physics. Today the layman understanding clicked. As of right now, quantum gravity is my answer to my Ask.

I love when something clicks in the brain. Hope yours does the same! Understanding is sensational.