A.J. Jacobs is the author of two "New York Times" bestsellers: "The Know-It-All" and "The Year of Living Biblically". His most recent work is "The Guinea Pig Diaries: My Life as an Experiment--"a collection of his articles, both new and previously published. He is the editor at large at "Esquire" magazine. He has written for "The New York Times, The Washington Post, " and "Entertainment Weekly, " and is an occasional correspondent for NPR. He lives in New York City with his wife Julie and their children. You can visit his website at ajjacobs.com.