We couldn’t let our month on online education end without a sit down with Sebastian Thrun. While he hasn’t had the billion dollar exits, Thrun is one of the only entrepreneurs today who could hold a candle to Elon Musk in the ballsy, futurist Renaissance man department. He helped invent Google’s self driving car and Google glass, but left all that behind to focus on remaking the world of eduction, with his startup Udacity.

The last time I talked to Thrun it was just after Udacity had raised $15 million. At the time there were a lot of open ended questions about monetization and class retention rates. In this clip, Thrun tells us how he’s solved those problems– and describes what hasn’t worked for Udacity. Yes, even for a futurist like Thrun, online education has its limits.

Interestingly, the key to Udacity’s success has to do with offering credits and accreditation for classes — the very opposite strategy of lynda.com.

[Image via Sebastian Thrun]