This weekend, Joseph Gordon-Levitt and Seth Rogen release their new cancer comedy '50/50.' Gordon-Levitt stars as Adam, a writer/producer at a public radio station in Seattle who works with his pot-enthusiast friend Kyle (Rogen). Is '50/50' a big stretch for Seth Rogen? Is '50/50' really a comedy? As a service, here is an answer to every query you could possibly have about '50/50.'