It's not live but it's definitely better than the ones another member here attended. I will put Greene's expertise up against his unnamed lecturer's any day. Just because it wasn't "live", doesn't make this lecture any less informative. So the self-proclaimed expert Rigelianerd (Dee Dee), based on attending his physicist's live lecture, means absolutely nothing. The lectures I've watched online and on YouTube, are by FAR more educational and valid. I've watched several of Greene's lectures. He is my favorite lecturer.