To celebrate the publication of the eBooks of The Art of Computer Programming, (TAOCP), we asked several computer scientists, contemporaries, colleagues, and well-wishers to pose one question each to author Donald E. Knuth. Here are his answers. Check informit.com/knuth throughout 2014 to purchase Vol 3-4A eBooks as they become available. If you want email notifications, send an email to taocp@awl