Apple CEO Tim Cook sneers at companies that have dedicated R&D departments -- but that's a deeply short-sighted approach to innovation, writes Greg Satell. While a visionary like Steve Jobs can get away with driving R&D single-handed, Cook would do well to recognize that not everyone can run a company that way. "Steve Jobs’ legendary focus can easily manifest itself into blindness about what's going on outside the company," Satell warns.

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