Bright colors, long tails, and dances of seduction: they may hurt a bird's chances of survival in the wild, but they seem to increase the chances of reproduction. Is this all part of natural selection or is sexual selection its own force in the bird world? Is there such a thing as beauty for beauty's sake? What can we learn from birds about the human experience of beauty? Listen as author and naturalist Matt Ridley speaks with EconTalk's Russ Roberts about a puzzle that kept Darwin up at night and that still troubles modern evolutionary biologists.

Feedback on exams and papers--grades and comments--should be more than an assessment. It should point the way to improvement. So argues educational consultant Daisy Christodoulou, emphasizing that actionable feedback has to be more than comments scribbled in the margins of a paper or at its end. Listen as she speaks with EconTalk's Russ Roberts about a new model for enabling educational improvement, with implications for learning to get better at writing and just about everything.

What can the restaurant business teach us about leadership and management? Listen as Will Guidara, the former owner of Eleven Madison Park, explains to EconTalk's Russ Roberts how his restaurant became good enough to be named the best restaurant in the world. Foodies will enjoy a look behind the scenes of a restaurant at the very top of its game, but the lessons for leadership and organizational culture are useful for anyone interested in creating and sustaining excellence.