ZANZIBAR, Tanzania, Jan.... 5( Xinhua)--President of Tanzania's Zanzibar Hussein Ali Mwinyi on Friday laid the foundation stone for the construction of the first seaweed processing plant in the Zanzibar archipelago. Located in the North Pemba region on Pemba Island, the plant is expected to be a boon to seaweed farmers in the region, Mwinyi said. The project, undertaken by the Zanzibar Seaweed Corporation in collaboration with the Britain-based company Nutri-San Limited at a cost of 7.4 billion