In the final episode of the season, Cardiff Garcia is joined by Malcolm Gladwell to discuss his work as co-founder and president of the audio production company Pushkin Industries, and host of “Revisionist History,” the successful podcast in which he reconsiders overlooked or misunderstood events of the past. The conversation took place in Pushkin’s recording studio in Hudson, N.Y., with topics spanning from what it means to challenge conventional wisdom to the delicate science of “hiring nihilism.”