In the case of research questions, it seems to me that often, you'd need the opinion of experts in many areas. For example I saw floating out there a question about a flat world. The ideal answer there would probably involve physics, geology, biology, anthropology...
Say you've got an answer that has already been created/edited by a geologist, a biologist and an anthropologist, how do you emphasize on the fact that this question would benefit from the point of view of a physicist?
How do you attract the right expert(s)?