RE: What AI would you build ?

One that could truly provide non biased information, and lack the ability to "create" new information out of thin air to fill in gaps in it's lack of knowledge.

I've created exactly that app, or something similar last week. I would feed it with a problem and it would look at the problem from every possible angle and then give a report that shows how the views clash and why to problem subsists. I've found that to be very interesting, especially when dealing with situations where there is a lot of manipulation and fake news...