Tim Whewell, just back from Mali, talks of retribution. Every conflict throws up winners and losers. And it's the nomadic Touareg, he tells us, who have become targets for revenge. Arguments over gun control have once again been dominating the headlines in the US and Paul Adams has been reporting on a debate he says is quintessentially American. Darius Bazargan has been in northern Lebanon, where he has been talking to factions allied to different warring groups in Syria. The Swiss train service has an enviable reputation, but Imogen Foulkes has been finding out it has managed to anger its customers. And in South Africa, Hamilton Wende has been out with a group of township teenagers whose extravagance and flamboyance is angering some of their elders.