[rng-concern]

The axioms of rationality, morality, etc. I've always found interesting.

We have certain axioms, (let me chose an arbitrary, and possibly not quite an axiomy-enough example): "human life has value". We hold this to be self-evident and construct our society around it.

We also often don't realize that other people and cultures have different axioms of morality. We talk/theorize at this high level, but don't realize we have different foundations.