“Could you reproduce Silicon Valley elsewhere, or is there something unique about it?” the venture capitalist Paul Graham asked in a much-quoted keynote address at Xtech back in 2006. Graham then went on to describe the key ingredients (a great university, an attractive town, smart people, youth, a tolerance for eccentricity and different thinking, and a cluster of other start-ups) that make Silicon Valley the unique ecosystem for entrepreneurial innovation that it is — and that differentiate it from its would-be imitators and competitors.