Please come and join me on Google+ tomorrow at 11am PDT. We'll be having a discussion of suspension of disbelief in worldbuilding - i.e. how easy or hard it can be to get people to believe in what you're showing them. This is a topic that I think has a lot to do with concepts of "show, don't tell," which apply to worldbuilding just as much as to anything else. I hope you'll come and join us!