This week on Science for the People we have a trio of fishy experts helping us look at how fish are adapted to their — sometimes extreme — environments, and what their behaviour can tell us about their intelligence and experience. We speak to Kristin O'Brien, a zoologist at the University of Alaska, about how fish manage to survive the extreme cold of Arctic waters. We talk with Heidi Golden, a postdoctoral researcher from the University of Connecticut, about the Arctic grayling. And we speak with Jonathan Balcombe, director of animal sentience at the Humane Society Institute for Science and...