Cities simply don't have the powers they need to radically innovate in cutting obesity or the number of disaffected teenagers.

Democratic nation states remain far more capable of managing the circuit of coercion, taxation and legitimation than any transnational bodies.

One of the lessons of history is that even the deepest crises can be moments of opportunity. They bring ideas from the margins into the mainstream.

Computing should be taught as a rigorous - but fun - discipline covering topics like programming, database structures, and algorithms. That doesn't have to be boring.

The most important innovators often don't need any technologies - just imagination and acute sensitivity to people's needs.

A lot of people in government don't really read books at all.

The most dynamic cities have always been immersed in the critical innovations of their time.