What insights can an emergency room doctor - who also happens to be a former astronaut - give on human nature? Dave Williams talks to Nam Kiwanuka about his new book, "Defying Limits."

How do people form their ideas about political issues, and do they spend dedicate enough time to such important work? Nam Kiwanuka talks to David Moscrop about his book, "Too Dumb For Democracy?: Why We Make Bad Political Decisions and How We Can Make Better Ones."