I'm just this guy, you know? As of June 2007 I live in Massachusetts.
xkcd updates without fail every Monday, Wednesday and Friday.
xkcd: What if updates every now and then.
Contact:
press@xkcd.com -- Press questions, etc (may take a long time to get to me).
whatif@xkcd.com -- What If? Questions.
contact@xkcd.com -- Anything else (Also may be slow).
Special 10th anniversary edition of WHAT IF?—revised and annotated with brand-new illustrations and answers to important questions you never thought to ask—coming from November 2024. Preorder here!