In Sanaa, members of the minority group known as "Muhamasheen" -- literally the "Marginalised" -- live in dismal conditions in densely populated slums. There is debate over the ethnic origins of the communit. Black Yemenis -- who make up between two and 10 percent of the population, according to various estimates -- have long struggled to survive, confined as they are to low-paying jobs like street sweeping or collecting garbage. They count among the poorest of the poor in the Arab world's most impoverished country blighted by more than five ...