In your opinion, in which other AOKs does it make sense to ask this question of discovered/invented?
Ethics.

What do you make of the term ‘a useful fiction’? To which AOKs do you think this may apply?
A useful fiction could potentially be most knowledge since the human mind is programmed to make models of real life to predict the future. In some ways, our knowledge is only a model of the world which may be different from person to person. Assuming that all AOKs were done in a correct way, this would apply to all AOKs except for mathematics and history (to some extent). In this case, AOKs such as religion and indigenous knowledge will not be taken into account as they can be debated day and night whether they are discovered or invented.