He was visiting a project providing computer literacy classes for slum children, some of those who've been bypassed by globalisation.

BBC: Cameron visit takes in both sides of India

When embarking on the film, Meirelles opted to use a cast of unknown amateur actors to play the slum children of Rio, many of them having experienced the hardship of the streets themselves.

BBC: NEWS | Entertainment | Brazilian Meirelles' route to God

Mahdi lives in the Baghdad slum called Sadr City with her five children.

NPR: U.S. Tries for Better Conditions at Iraq Prison Camp

And children in the militantly Shia Baghdad slum of Sadr City chanted the name of Younis Mahmoud, the striker whose goal won the game and who is a Sunni.

ECONOMIST: The euphoria of a footballing victory faded fast

Barlow's Sing, which was co-written by Andrew Lloyd Webber, features 210 musicians including the African Children's Choir, Aboriginal guitarist Gurrumul, Slum Drummers from Kenya's Kibera slum and the Royal Solomon Islands Police Force Band, as well as the Military Wives choir - and Prince Harry on tambourine.

BBC: Gary Barlow's Jubilee songs top single and album charts

In a primary school near a huge slum in Dhaka, pupils aged between six and 10 include the children of rickshaw drivers and women who break bricks for a living.

BBC: The harsh necessity of child labour

It is most common among children especially low-income kids that live in slum housing in Fresno, Detroit, Washington DC or just about any urban area.

FORBES: Pay Now, Or Pay (More) Later: The Crying Need to Fund Community Prevention

It will end the militias' armed presence in the sprawling eastern Baghdad slum, he said, and clear the district of roadside bombs and mines that the United Nations Children's Fund says has rendered many roads inaccessible.

CNN: Iraqi government, al-Sadr group sign cease-fire

There has been little economic recovery in slum areas, says Father Joe Maier, of the Human Development Foundation, a group working with poor children.

ECONOMIST: Thailand