Many months ago, when the Special Counsel’s investigation into Trump/Russia was at its height, a photograph appeared on social media. At the time it made for a trivial story, typical of the Twitter age. Somebody had spotted Robert Mueller visiting an Apple store and their picture showed him sitting with his wife at the “Genius Bar” where they were clearly being taught how to do something by one of the tech gurus. The picture caused some amusement. How, after all, could the great Robert Mueller, former Director of the FBI and the man charged with hunting out the darkest secrets in Washington, be stumped over something so mundane?

On Wednesday, we had something of an answer to that small riddle.

Robert Mueller, it turns out, is fallible.