We all like to throw around terms that describe human behavior — “bystander apathy” and “steep learning curve” and “hard-wired.” Most of the time, they don’t actually mean what we think they mean. But don’t worry — the experts are getting it wrong, too.

In a special holiday episode, Stephen Dubner and Angela Duckworth take turns asking each other questions about charisma, wealth vs. intellect, and (of course) grit.