The True Measure of a Good Idea

Compare the Segway with disposable diapers and what do you see? The difference between mere invention and world-changing innovation

Anyone ridden a Segway recently? This month marks the four-year anniversary of Dean Kamen's much-hyped self-balancing upright scooter. Upon unveiling his invention, Kamen promised it would eventually replace the automobile for short-distance trips and offer easier mobility to everyone from postal workers to the elderly.

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