Mission unexpectedly possible

With the new Mission Impossible film playing in cinemas, the Unexpected Elements team is channelling Tom Cruise’s energy to see if scientists can push the boundaries of what is considered ‘impossible.’ First up, we fuse medieval alchemy with particle physics and explore a method to turn lead into gold. We then look at the latest research that uses artificial intelligence to help us humans communicate with animals. We put the spotlight on a favourite trope of science-fiction films – time travel! String theorist Brian Greene of Columbia University explains how going to the past, or back to the future, may or may not be hypothetically possible. We also ponder ancient auroras, whether ants can plan a Hollywood-style heist, and what it takes to understand our consciousness. Presenter: Marnie Chesterton, with Affelia Wibisono and Andrada Fiscutean Producer: Imaan Moin, with Alice Lipscombe-Southwell Studio engineer: Mike Mallen