Ask HN: What would you like to know about Ruby on Rails and/or Railscasts?

I had a fascinating Skype conversation with David Heinemeier Hansson (creator of Ruby on Rails) and Ryan Bates (creator of Railscasts) this morning. https://twitter.com/MilesForrest/status/689148814985281536 Although I can't share the details of the conversation, I would like to know what others would ask these two people if a conversation like it happens again. Thoughts?