17 May 2012 Last updated at 04:14 GMT

Trial told of Srebrenica chaos
Prosecutors describe the chaos leading to the 1995 Srebrenica massacre, on the second day of Bosnian Serb ex-army chief Ratko Mladic's war crimes trial.

White births now minority in US
Children from racial and ethnic minorities now account for more than half the births in the US, estimates from the latest census data say.

Disco singer Donna Summer dies
US singer Donna Summer, famous for disco hits including I Feel Love and Love To Love You Baby, dies at the age of 63.

Berlin airport hit by fresh blow
The opening of Berlin's new airport is put back again, probably until March 2013 and its technical manager is sacked.

Facebook share sale approaches
Facebook shares will begin trading in New York on Friday in one of the most eagerly anticipated share flotations in recent stock market history.

Syria opposition head 'to resign'
The head of Syria's main opposition umbrella body, the Syrian National Council, says he will resign amid growing criticism and rifts within the group.