"The global boom in skyscrapers-why it's happening now, how they're made, and what they do to cities and people. We are living in a new urban age and its most tangible expression is the "supertall": megastructures that are dramatically bigger, higher, and more ambitious than any in history. In Supertall, TED Resident Stefan Al-himself an experienced architect who has worked on some of the largest buildings in the world-reveals the advancements in...