The valuation of the largest companies in the world fluctuates day to day, even minute by minute, but true success is a marathon, not a sprint. You’ve probably heard about Apple’s, Google’s and Amazon’s garages—that’s because all three companies started out, well, in a garage. What you probably have never heard of is Denny’s, in East San Jose, California. That’s where, in 1993, drawn to cheap coff...