Self-experimenter and author A.J. Jacobs joins Question of the Day for the first of five episodes alongside Stephen and James. Instead of focusing on one question, today James and Stephen talk to A.J. about some of the largest experiments he's performed on himself, including finding out how much he loves his wife via an FMRI, and stoning an adulterer in Central Park while "living biblically" for a year. The three also touch upon the history of mattresses, whether a "square beard" gene exists, and what the official food of "Conception Day" should be.