The smartphone was supposed to usurp everything. And in a way, it has. The point-and-shoot camera market? Mostly gone. MP3 players? Even Apple has given up on the classics. And then there are the host of tiny gizmos and gadgets now replaced by our ubiquitous pocket computers — everything from mapbooks to alarm clocks to calculators. As a result, conventional logic has been that tech that focused on just one thing was going to become obsolete, or be relegated to tiny, mostly irrelevant...


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