Muhammadu Buhari sworn in as Nigerian president
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An historic day for Nigeria as Muhammadu 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 has been a frantic copper rush. And the island of Goree's historic colonial villas open their doors exceptionally to tourists and art.