Christian Eriksen's heart device, and air leaks on the ISS

Coming up, Danish footballer Christian Eriksen is reportedly "doing well" after collapsing for a second time during an international match. Did a tiny device called an implantable cardioverter defibrillator save his life? Plus, whether magnetic immune cells in the liver can drive a pigeon's homing instincts; how astronauts repaired air leaks on the International Space Station; and we ask whether maths can help us decide what to have for dinner. Like this podcast? Please help us by supporting the Naked Scientists (thenakedscientists.com/donate)