it is called urban mining, scavenging through the scrap metal in old electronic products in search of such gems as iridium and gold, and it is a growth industry around the world as metal prices skyrocket. (27 April 2008) In Cairo Slum, the Poor Spark Environmental Change (audio and text) Liane Hansen, Weekend Edition, National Public Radio In Cairo, the heart of the city's upscale area is known a