Nigeria's telecoms regulator has approved a tariff hike by operators-customers are groaning.   A year after ground-breaking malaria vaccination campaigns were launched in Africa-we assess the progress.   And why is Benin granting citizenship to descendants of the victims of the transatlantic slave trade?   Presenter: Charles Gitonga Producers: Blessing Aderogba. Yvette Twagiramariya and Blessing Hassan Senior Producer: Paul Bakibinga Technical Producer: Chris Kouzaris Editors: Andre Lombard and Alice Muthengi