The changes under way in the NHS in England are as yet largely invisible to the patient, but they touch every part of the health service.

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The hinge technology will have to be an engineering marvel, and making the folding crease of the screen invisible will pose problems in materials, optics, and touch technologies.

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In London almost everything is labeled 'You mustn't touch, ' and though the label is invisible, it's just as bad, because you know it's there, or if you don't you jolly soon get told.

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