How well do you understand your world?

Available for over a year

What proportion of your country are immigrants? What proportion of teenage girls give birth each year? Research suggests most people get the answer to these questions, and many others about everyday facts, very wrong. Tim Harford interviews Bobby Duffy, Global Director of Ipsos Social Research Institute and author of the book, Perils of Perception: Why We’re Wong About Nearly Everything, about our most common mistakenly-held beliefs and what they reveal about us. (image: The pregnant belly of a 14 year old girl in Britain. Photo Credit: Tina Stallard/Getty Images)