All week we’ve brought you clips of our sit-down with Udacity’s Sebastian Thrun. But his sometimes radical new take on reinventing education is one of the least sexy — and least radical — projects he’s worked on. In his previous role at Google, Thrun was responsible for two of the coolest things the company has developed: The self-driving car and Google Glass.

Google PR put the kibosh on Thrun talking much about the future of these projects, but they couldn’t bar us from asking about the thought process of the man behind such wildly disparate projects. We wrapped up our sit down with Thrun by asking how he innovates and what drives him. He’s certainly not an entrepreneur who goes for the easy lay-up.