The Happy Pod: The dolphins who 'smile' at their friends

Available for over a year

Researchers have found that just as we smile at friends, dolphins change their expression too while interacting. Also: the college baseball star with a prosthetic leg and the first robotic double lung transplant. Presenter: Jannat Jalil Music composer: Iona Hampson (Photo: A dolphin with a wide grin. Credit: Federica Vantagio/Elisabetta Palagi/Livio Favaro/ZooMarine/PA)