The signed limited edition of  Medea: Harlan’s World   has one of the greatest collections of signatures of all time. Sheets were circulated among eleven legendary authors, then bound into a deluxe edition of one of the most ambitious experiments in the history of science fiction. Like many, many good stories, this one starts with Harlan Ellison. I’ll do what I can to introduce him in case his name is unfamiliar – how quickly our giants fade away! (Ellison was only five foot two, not quite a giant, but he had a personality the size of a weather system.) Stick around for a description of the…