Ed Glaeser talks about his new book Triumph of the City. He makes a few important points. Actually many, but two i want to focus on. Living in cities now improves life expectancy rather than making it worse. And he also makes a point about how technology such as facebook makes living closer together ever more valuable. It is a paradox I've mentioned before. But its also why we will not see the end of Universities as we know them. All the new technology is still just a complement to face to face learning and sharing, not a substitute for it.