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.

We found a secret room on the podcast! Learn more about your ad choices. Visit podcastchoices.com/adchoices

MSF pulls out of Haiti's capital Port-au-Prince after attacks on staff. Also: US approves supply of antipersonnel land mines to Ukraine, why olive oil prices are plummeting and tennis bids adios to Rafael Nadal.

Harper went to homecoming with her ex! Learn more about your ad choices. Visit podcastchoices.com/adchoices

Billy and Susan's life changed when they spotted a starving otter. Now, Molly is part of the family and a film has been made about their story. Also, the invention giving people with disabilities greater freedom.

We played survivor on the podcast! Learn more about your ad choices. Visit podcastchoices.com/adchoices

Republicans secure total control of US congress after winning the House of Representatives. Also: climate impact of jet condensation trails and the kidults rediscovering the joy of toys.

Kenzie tells a crazy stalker story! Learn more about your ad choices. Visit podcastchoices.com/adchoices

We hear about innovative environmental projects awarded millions of dollars in this year's Earthshot prizes. Also: the twins cleaning streets for free; detecting tumours with graphene; and a remarkable Himalayan rescue.Presenter: Andrew Peach. Music composed by Iona Hampson.

Kate and Harper get in a fight on the podcast! Learn more about your ad choices. Visit podcastchoices.com/adchoices