California is a house divided, with global entertainment powerhouse Hollywood in the south — epicenter of the movie, TV and music businesses — and global technology powerhouse Silicon Valley in the north.

It’s no secret that Silicon Valley wants to invade Hollywood with disruptive Internet-based content distribution systems and computer-generated everything.

But now Hollywood wants to invade back. In fact, some of Hollywood’s biggest stars have tried their hand at launching and running technology companies and helping to design products.

Some of these celebrities are serious about it and have come out with some surprisingly good or ambitious projects.

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