Firstly, as the author of the course, many thanks for the publicity. Secondly, a teething problem which caused the video lectures to bring up an error screen h

Firstly, as the author of the course, many thanks for the publicity. Secondly, a teething problem which caused the video lectures to bring up an error screen has been fixed. It's my first attempt at teaching (I hope that's not too obvious). I volunteered to be a guinea pig for Coursera's new "community guided project" courses, which has been very educational for me. I hope others manage to learn something from it too.