Stefan Kraus describes how volunteers may help to rebuild Vanuatu using smartphones
BBC World Service
How to protect antibiotic effectiveness in humans by giving less to chickens.
BBC Radio 4
Miranda Krestovnikoff presents the story and sound of the Savi's warbler. (R)
Cyfle i glywed rhai o bigion 'Galwad Cynnar' eto.
BBC Radio Cymru
The impact of gentrification on working class people. Plus the division of domestic labour
How will the next government tackle Britain's environmental problems? Tom Heap reports. (R)