![Eduardo Paes: The 4 commandments of cities](https://pi.tedcdn.com/r/pe.tedcdn.com/images/ted/f45ba92c04bdaedad7cf56e5182efb7953516601_800x600.jpg?h=200)
Eduardo Paes is the mayor of Rio de Janeiro, a sprawling, complicated, beautiful city of 6.5 million. He shares four big ideas about leading Rio -- and all cities -- into the future, including bold (and do-able) infrastructure upgrades and how to make a city "smarter."