Without any doubt at all teacher quality is the fundamental differentiator. Not just incidentally of education but I would argue probably the biggest single differentiator of success for the nations of the 21st Century.

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But inspiration? - That's when you come home from abroad and are asked: Well have you found inspiration? - and fortunately you haven't. But the impressions sink in of course and may emerge later: None of us has invented the house that was done many thousands of years ago.