If you feel guilty about eating cows and pigs but have no problem downing a tuna sandwich, we have some bad news: fish feel pain. That's the conclusion of a study conducted at Purdue University on two groups of goldfish. One group, injected with morphine, acted totally normal after being subjected to painful stimuli. The other group, morphine free, showed wary and anxious behavior after the pain was stopped. Researcher Joseph Garner, an assistant professor of animal behavior and well-Being, joins The Takeaway to explain the study and why it's significant.