Dawn has just broken but classes have already started at the village school in Aqualaar, in the Garissa district of Kenya's arid north-east. Around 30 children, mostly from families of Somali herders, sit listening as an enthusiastic 18-year-old teacher, Ibrahim Hussein, gives an arithmetic lesson. The school is really little more than a sandy patch of ground under an acacia tree. Mr Hussein's blackboard hangs from its branches. There are no desks or chairs. Pupils follow the lesson by using sticks to scratch numbers in the sand.
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