[East African] Tanzania's commercial capital Dar es Salaam is humming along nicely, in harmony with the hustle and bustle of residents and visitors battling in their daily struggles. It all seems ordinary but, again, it isn't. Watching the ebb and flow of the human and vehicular traffic on the streets, it is easy to discern the unsung spirit that has for the past two decades distinguished the country as one of the most rapidly growing economies in Africa.