...and of course, questions you should be able to answer if you expect other people to listen to you about something:
Why are we talking about this, i.e. why does this matter? Why does it matter to you? What are the concrete ways it will it affect future decisions I will make?
How, specifically, do you know this? How does anyone? Did you see it? Talk to an expert? Believe an authority figure?
How certain are you? Why?
If something different were true, what would happen? How do you know that?
Why are you telling me? What do you get out of my knowing this, or changing my mind?
So far I haven't been able to come up with a good mnemonic.