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From superstar athletes to self-help devotees, advocates of positive thinking--imagining yourself succeeding at something you want to happen--believe it is a surefire way to help you attain a goal. Past studies have backed that idea, too, but now researchers are refining the picture. Paint your fantasy in too rosy a hue, and you may be hurting your chances of success.

The real world's baseball season starts today, which also means batters up for another stat-fueled year of the fantasy version.

In an excerpt from his new book Ten Steps Ahead, author Erik Calonius tells us about Edwin Land, inventor of the Polaroid Camera, unsung hero of consumer products, and personal hero of Steve Jobs. Steve Jobs admits to few idols