On the 500th day since nearly 300 Nigerian schoolgirls were abducted by Boko Haram, those hoping for their return march in their memory and call for the government to keep up the search. Also, we discover the town of Adrar in Algeria. For centuries it has been a spiritual crossing point between North Africa and the rest of the continent. And engineers from Laos head over to Central African Republic. They're heading up well drilling workshops, helping locals to build low-cost wells.

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