Ofeibea Quist-Arcton

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It's been more than a month since Nigeria's president, Muhammadu Buhari, traveled to London on what was billed as two weeks' vacation — with routine medical check-ups. He hasn't been back home since.

His government says the 74-year-old is in good health. But many Nigerians are not convinced and wonder whether their president is gravely ill — or worse.

Buhari's long absence comes amid Nigeria's worst economic crisis in years and other pressing national problems, including a famine in the northeast, the region badly hit by extremist Boko Haram violence.

Southern Africa is facing an invasion by an army — but not the sort of force you can defeat with ammunition. This foreign invader is an agricultural pest that is threatening the breadbasket of the region.

Zambian farmer Daniel Banda noticed in late December that something was munching through his crop of corn, destroying the maize fields on his small farm just outside the capital, Lusaka. Voracious caterpillars, known as fall armyworms, had nestled in the cobs and chomped through the leaves.

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In South Africa, President Jacob Zuma is facing accusations of corruption. His hold on power is not in question, but his ability to address the nation is, like last night in Parliament. NPR's Ofeibea Quist-Arcton reports.

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Fortunate Nyakupinda has parked her hatchback by the side of the busy main road leading to the industrial area in Harare — where she sells used clothing for men from the trunk and the back seat.

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