This is a great read, and it's also worth reading the comments from HNers from 2009 when first submitted, and 2013 on the first resubmission. It's been submitt

This is a great read, and it's also worth reading the comments from HNers from 2009 when first submitted, and 2013 on the first resubmission. It's been submitted many times since then, but without additional insights or comments, but those first discussions are interesting, sometimes as much for what is not said as for what is said. That requires "reading with attention", and you may decide it's not worth your time.