At a small think tank in Italy, scientists and philosophers debate the nature of intelligence. Dartmouth neuroscientist Peter Tse traces the evolution of human intelligence — and says our imagination is both our greatest gift and deadliest weapon. 

A group of scientists, philosophers and writers discuss and debate the many different kinds of “intelligence” — and why we’re still grappling with our understanding of sentience in plants, animals and AI. Is a robot dog actually smart?