Stephen Dubner and Angela Duckworth have spent years exploring the weird and wonderful ways in which humans behave — Dubner as the host of Freakonomics Radio, Duckworth as a research psychologist and author of Grit. They both like to ask a lot of questions, and have come to believe there’s really no such thing as a stupid one. With No Stupid Questions, they put this belief to the test, with conversations ranging from friendship and parenting to immortality and whether dogs are better than people. The resulting podcast is incisive, humane, and occasionally...