The urge to innovate can be both a blessing and a curse, writes Saul Kaplan. There's nothing better than the rush of finding a solution for a tough problem, Kaplan writes -- but the flip side is that true innovators have a constant itch to find better ways of tackling even mundane challenges. "The job is never done. Celebrations are muted and short-lived as innovators move on to explore the next better way," he writes.

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