An historic day for Nigeria, Muhamadu Buhari, is officially sworn in as president, vowing to tackle corruption and face Boko Haram's violent insurgency "head on". Also, artisanal miners in DR Congo take their revenge, after discovering a copper deposit in a poor neighbourhood of Katanga province since then there's been a frantic copper rush. And, this Friday, the island of Goree's historic colonial villas open their doors exceptionally to tourists and art.
