Experts discuss the future of drones and how they might be used for good causes (R)
BBC World Service
Activists are paying farmers £5,000 to pull out of the badger cull.
BBC Radio 4
David Attenborough presents the bar-headed goose of Central Asia. (R)
An exploration of the meaning of sacrifice to mark the centenary of World War One (R)
Cyfle i glywed rhai o bigion 'Galwad Cynnar' eto.
BBC Radio Cymru
Science writer Stuart Clark explores the relationship between scientists and computers. (R)