This week at Umeå University in Northern Sweden, I was taken to see a class being taught by videoconference.  I’m familiar with this way of working; all the students seemed engaged and happy, and the teacher was relaxed and obviously very experienced. The room was a good size, and the class was discussing critical thinking. So far, so routine. But there’s something about the strange warping of distance and time that occurs when you can see someone sitting in a…