Rory Sutherland, vice chairman of Ogilvy Group, takes to the stage at the TED conference to opine on the benefits of intangible value, placebos and how tinkering with perception can be better than trying to fix reality. An erudite and rather comical talk from the quintessential adman about the psychology of marketing. And his conclusion has interesting consequences for how we look at life. Highlight of the speech: his idea to solve the world’s environmental problems by making all convicted paedophiles drive Porsche Cayennes.