While shortages of water, food and medicine in sub-Saharan Africa have long attracted the attention of foreign aid workers, a lack of books is not normally considered one of the most pressing matters in the region.
Yet for David Risher, a 47-year-old American and former Microsoft and Amazon executive, the surprise was that so little attention had been given to what he came to see as one of the most obvious problems that could be resolved through modern technology.
Travelling in Ecuador several years ago, Mr Risher visited an orphanage where he came across a room filled with books that had been locked away from the children there.
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