After filmmaker Penny Lane decided to donate a kidney to a stranger, it took three years and a complex, often infuriating, sometimes terrifying process to make it happen. Along the way, being a filmmaker, she eventually decided to chronicle her experience and explore the question: How can a choice that seems so obvious to the donor seem so strange to everyone else? Listen as she tells EconTalk's Russ Roberts what she learned, what's still a mystery, and what she hopes we'll all take away from her story.