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The first of a 3 episode arc on the Agricultural Revolution.  Yes, this is the Jethro Tull episode. The focus is on engineering and the early inventions often associated with the Agricultural Revolution – the wrong ones.  Then we turn to the Dutch and their development of efficient water transport which allowed for a much larger hinterland to support growing cities.  This development is as much social as it is engineering and finance, and the social part is still mysterious to historians.