If we couldn’t trust each other, our lives would be very different. We trust strangers not to harm us, we trust our friends to take care of our most prized possessions, we even trust politicians (sometimes) to come through on their campaign promises. But trust may also come at a high cost: it can leave us vulnerable to lies, deception, and blackmail. So is it reasonable for us to be so trusting? And how should we treat those who trust us? John and Ken put their trust in Stanford philosopher Jorah Dannenberg, in a program recorded live at the Marsh Theater in San Francisco.