In March 1848 San Francisco newspaperman Samuel Brannan announced that gold had been found in California. In the gold rush that followed, more than 300,000 people headed to the area to make their fortunes. Over 150 years later, there’s still a gold rush in California — now re-located to Silicon Valley. Even organizations that remain headquartered in other cities have set up innovation outposts there in the hope that high-tech silicon dust will rub off on them.