A.J. Jacobs is an author, journalist, lecturer and human guinea pig. He has written four New York Times bestsellers that combine memoir, science, humor and a dash of self-help. Among his books are The Year of Living Biblically and The Know-It-All. He has given several TED talks that have amassed over 10 million views. His latest book is “The Puzzler,” which Booklist called “ridiculously entertaining,” and The New York Times called “A romp, both fun and funny.” He was the answer to 1 Down in the March 8, 2014 New York Times crossword puzzle. He is owner of the world’s hardest and most time-consuming puzzle ever made. Website: https://ajjacobs.com/   For show notes and transcript visit: https://kk.org/cooltools/a-j-jacobs-author/   If you're enjoying the Cool Tools podcast, check out our paperback book Four Favorite Tools: Fantastic tools by 150 notable creators, available in both Color or B&W on Amazon: https://geni.us/fourfavoritetools