Thank you very much for your efforts, I've been enjoying ML class so much. The only thing I disagree with, is that the courses are time-bound. I have a day time job, and I'm only able to take 1 course. However I don't see any reasons why you shouldn't allow people getting through the courses outside of the time frame. This would be more convenient for a good part of the target audience, because it's the people who actually don't have enough time to enroll in the real university course.