How Silicon Valley's 'rich ecology' works

Extract . . .

"Silicon Valley is an elusive place. You won't find it on maps, there are hardly any guide books and there are certainly no signs. But out of the Valley have come ideas and inventions that have changed our world. The region has spawned an endless list of successful companies like Intel, Facebook and Apple, creating vast wealth and thousands of jobs in the process. 

In a rather laidback Californian way, the place crackles with enterprise. If there's one address that defines the things that happen in Silicon Valley, it's 165 University Avenue, a low-rise office building in the town of Palo Alto that has been rented - and outgrown - by tech giants like Google, PayPal and Logitech."

Link

http://www.bbc.co.uk/news/business-11016341