Should monkeys have the same rights as humans? What about elephants, ants, or invertebrates? NYU philosopher Jeff Sebo makes the case for expanding your moral circle to many more beings than you might expect, including those based on silicon chips. Listen as Sebo and EconTalk's Russ Roberts discuss to whom and what we owe moral consideration, how we determine a being's intrinsic moral significance, and why we have ethical obligations to others, anyway. They also discuss human exceptionalism--the idea that humans should be prioritized over other beings.

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.