Enrique Peñalosa: Why buses represent democracy in action. Duncan Davidson: Why do we hate seeing photos of ourselves? TED talk - Oil Economics, Ecology & Sociology - Lisa Margonelli. Jennifer Pahlka: Coding a better government. Carlo Ratti: Architecture that senses and responds. Martin Seligman: Why is psychology good? Alain de Botton: Atheism 2.0. Jonathan Haidt: Religion, evolution, and the ecstasy of self-transcendence. David R. Dow: Lessons from death row inmates.