Oh man...that's a hard question. I absolutely love his podcasts.
I'll toss a few questions out there, including one of his own:
- Which single habit had the greatest impact on his life?
- How does he focus on one project/hobby, when there are so many fascinating things vying for his attention? How does he choose which one to prioritize?
- What is(are) the book(s) he gifts to people most frequently?