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Re:Google’s “20% time,” which brought you Gmail and AdSense,... by digikata on Friday August 16, 2013 @02:11PM (#6225737)
San Diego is something of a Silicon Valley for genetics and other life sciences, LA is/was something of a hub for aerospace and arguably movie technology (it's more diversified now, but does have a Silicon Beach movement).

I'm not sure what objective measurement one could use to really determine "innovation", maybe economic activity from industries or products established within the last x years?

Re:Google’s “20% time,” which brought you Gmail and AdSense,... by cpeterso on Friday August 16, 2013 @02:21PM (#6225800)
And Qualcomm is headquartered in San Diego.