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Several scientific studies in the US and UK appear to contradict you. Studies have show an improvement in literacy in kindergarten pupils and improved maths ability's in 7 to 10 year olds. This is however a very new area and therefore conclusions either way cannot be drawn. Small scale pilot test are a great way to assess benefits and review the potential of a full scale role out. The work idea ever would be to dismiss this development completely or to rush out and buy 2000 devices without any planning on how to implement it.