Why are Nigerians swapping their high-value banknotes?

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Nigerians have to swap their current high-value banknotes for new ones by the end of January. Why the change? Also, we take a rare look at the workings of an elite Somali military unit fighting Al Shabab. Plus, from Harare - President Mnangagwa makes this year's state of the nation address in Zimbabwe's new parliamentary building. More on those stories in this podcast with Audrey Brown