Like most children in her village, Gechawa Gandesha laughs when she is asked why she will not go on to senior school. "It would take me almost a week to walk there," said the 14-year-old, who already walks more than four kilometres to her current school. Gechawa is at the top of her primary class, and longs to become a doctor. Her headmaster says she is more than capable of achieving that. But she lives in one of the remotest corners of Ethiopia, and schools are few and far between.