What is the biggest obstacle you have faced professionally?

Tony was cautious. He suspected I’d wired the radio telescope up wrong. So we checked on another radio telescope on the site. The thing was pulsing nicely on mine but as we stood by the pen recorder of this other telescope, nothing happened. It was a horrible moment. And suddenly there it was, five minutes later because we had miscalculated when the telescope would see it. If we’d miscalculated by 25 minutes, we’d have all gone home and the story would be different.

The hard part was getting around this, this was a religion among physicists, and in fact even in the Bohr-Einstein debates, and with Schrödinger also, the universal religion was quantum mechanics makes correct predictions, period, no, off the table. What Bell's theorem and in particular our version of it, the Clauser-Horne-Shimony-Holt experimental prediction, showed that either that had to be wrong, nor Einstein's whole legacy had to be wrong. I think at the time people who were critical of doing the experiment didn't realise really what was at stake, that it was that cut and dried between two religious icons, if you will, the field of physics. Since I kind of was the inventor of the CHSH inequality and the CH inequality and all that, I knew exactly what it was all about. But it took a long time for that to filter in.