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How social media is transforming warfare, and how warfare can permanently mark the mental health of the journalists covering it.

Ed Butler speaks to David Patrikarakos, author of War in 140 Characters, who has spoken to dozens of ordinary citizens and combatants who have taken to Twitter and Facebook to reshape the conflicts they are living through.

Also in the programme, the mental and physical trauma of war. Dean Yates explains how his stint as Baghdad bureau chief for news agency Reuters left him with PTSD, and how he is now helping colleagues recognise the symptoms. Plus Brett Moore, head of Mobile IV Systems, demonstrates his company's self-regulating blood transfusion bag.

(Picture: Photojournalists wearing gas masks flee from teargas during clashes with Israeli forces on the West Bank; Credit: Abbas Momani/AFP/Getty Images)