But we desperately want live lectures to work. We’ve done them for so long now that they seem a part of who we are. And we are tantalised by the mirage of thinking that if only everyone turned up, they would be a far more efficient way of teaching than the seminar or the tutorial. Desperately. So desperately that we are prepared to ignore the prodigious financial and environmental cost of heating or cooling large empty spaces. So desperately that…