In Mauritania, northwestern Africa, slavery is a fact of modern life. It's estimated that 10-20 percent of the country's 3.5 million people are still enslaved in a system rooted in ethnic discrimination.
In 2002, the then Israeli Prime Minister Ariel Sharon approved the construction of a barrier wall that would run along the ceasefire line of 1949 with the intention of separating Israeli territories from the Palestinian West Bank. In Bethlehem, graffiti artists have started using the wall as a canvas for political protest and socially critical art. By Laura Overmeyer