Pakistani aid workers offload USAID food supplies from an Army helicopter in Kallam Valley during catastrophic flooding in 2010. Behrouz Mehri/AFP/Getty Images hide caption

itoggle caption Behrouz Mehri/AFP/Getty Images

A worker piles sacks of corn at a market in Guatemala City. Daniel LeClair/Reuters /Landov hide caption

itoggle caption Daniel LeClair/Reuters /Landov