Laurie Taylor discusses the security impact of the Olympics. Also, sport under communism.
BBC Radio 4
Gareth Mitchell meets the engineers who will transform the way we fly around the world.
BBC World Service
The protective ozone layer could be affected by climate change and more chaotic weather
Rachael Garside goes to a livestock mart in Welshpool to meet auctioneer John A Jones.
BBC Radio Wales
Deaths in farming accidents increase in Northern Ireland.
Hanging out with millions of bananas to learn about global food supplies (repeat).
Gareth Mitchell meets the engineers who are designing flying cars and green aircraft.
Simulating a whole bacterium, UK tsunamis, melting Greenland ice, and herd behaviour.
Tuesday 31 July 2012