Award-winning science fiction and fantasy author Jay Lake talks about worldbuilding from the point of view of the genre that defined the process. How do you make a world make sense? When  does the lone telling detail tell all, and when do you need to know the economic and social nitty gritty? How to balance rigor with hand-waving, and make your reader *believe.* The discussion is from a genre perspective, but the techniques apply to any variety of fiction.