Every worker has a unique, amazing superpower -- and a kryptonite-style weakness that threatens to bring them down, writes Josh Linkner. Whether you're a math whiz, an unbeatable negotiator or a visionary creative, it's vital to understand your strengths and weaknesses. "True heroes play to their strengths," Linkner writes. "They spend a disproportionate amount of time being the absolute best at a small number of things rather than trying to master every skill."

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