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The iPod is now twenty years old and is no longer a gadget, but the first cultural icon of the Third Millennium. After hundreds of millions of units sold, it is the symbol of a revolution that is not over yet. In music, with the introduction of a new sales model that focused everything on single music tracks instead of albums, but also in computing, with the first commonly used gadget based on the Arm processor: the one from which Apple then built the success of the iPhone, the iPad and now
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