Stranded astronauts return, and the whale pee funnel

In this edition of The Naked Scientists: Stranded Nasa astronauts Butch Wilmore and Suni Williams come down to Earth with a splash and some awesome drone footage; also, Cambridge scientists are mapping where to find the world's rarest minerals; and the massively under-appreciated role that whales play transporting nutrients thousands of miles...using their urine. Like this podcast? Please help us by supporting the Naked Scientists