This app will stop working on 3rd April 2017. But you can still listen to BBC iPlayer Radio via your browser by visiting bbc.co.uk/radio
Does the key to curing Alzheimer's lie with a poor extended family in Medellin, Colombia?
BBC Radio 4
Owen Bennett-Jones explores Pakistan's connections to jihadi groups.
Martin Plaut investigates alleged shortcomings at gold mines in South Africa.
Lucy Ash returns to some significant stories Crossing Continents covered in recent years.