Part four of the case study series.
I submit the following for review.
These are my 5 most popular questions order approximately from less to more popular. (though the last on would more likely lend on place 2 or 3, but has been put as last since it was a follow up of what ended up being number 2)
Can I keep our universe, but without the speed limit (of light)?
About world building?
It seems to me like a pretty fundamental worldbuilding question to me.
Risking off-topic?
If anything it errs a bit towards a too scientific side, but I think physics.SE wouldn't appreciate this question and worldbuilding.SE would answer it more in the way that I was hoping. Though as Pavel Janicek's answer pointed out, this question may not be the right one to pose when building a world (to some).
How do I prevent my turtle from collapsing under its own gravity?
About world building?
Creature design is an accepted topic on worldbuilding.SE and this particular creature aspires to be roughly the size of a world, I think this is a pass.
Risking off-topic?
No, this question is very much answerable.
What could cause an avian species to become intelligent?
About world building?
Yes, no doubt about it.
Risking off-topic?
It leans a bit towards idea generation (or simply too broad). There are many possible answers and there is no very clear way of picking one answer over another. On the plus side, it does have a rather well defined scope.
Could a disaster kill all (human) life on Earth but leave astronauts in low orbit alive long enough to return?
About world building?
Debatable, but I think it falls on the right side. Disasters may be rather plot-y, but designing or choosing a specific disaster, especially a worldwide one, seems more worldbuilding.
Risking off-topic?
Yes, I think it's an interesting question and has the starting and end point well defined as well as a tight scope, but even though it's not posed as one, it is a very list-inviting question. And it did in fact attract lists as answers. I guess the deciding factor here would be: are these lists potentially endless and do the minor differences between list items really matter, or can things be generalised?
What should three men and three women do if everyone else is dead?
About world building?
I don't know. It is about the actions of individuals, but they are the only remaining individuals and I did ask for whatthey should/can do and not what they would do. I feel like this one might fall on the wrong side of the line.
Risking off-topic?
It's definitely a tad broad and invites speculative answers, I'm not entirely sure if this alone would make it closeworthy.