Why tech giants are putting the silicon back in Silicon Valley

When Apple bought chip design firm PA Semi in 2008, it seemed like a crazy move. Who’d want to go back to the days when giants like IBM did everything themselves, including making software, hardware and chips? Now, in the age of smartphones and tablet computers, Apple has what it needs to control its own destiny. It’s starting to look crazy like a fox. And rivals like Google are following Apple’s lead.

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