One way to understand the intelligence of a species is if they can feel pain. Marina Bolotnikova, Deputy Editor for Vox’s Future Perfect, joins host Krys Boyd to discuss how scientists are coming to the conclusion that fish feel pain, why it’s so difficult to observe them in their natural environment and compare their nervous systems to that of a human’s, and why this study new information has deep ethical implications. Her article is “The surprisingly profound debate over whether fish feel pain.”