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Google challenges Apple's Siri

New voice search in Android 4.2 keeps Siri on her toes, Microsoft sells more than 4 million copies of Windows 8, and Roku makes it easier to search the streams.

Now playing: Watch this: Google challenges Apple's Siri

While CNET's New York office works to get power back after the storm, we're bringing you the Update show from our San Francisco office. Tuesday's top tech stories include:

- Superstorm Sandy has knocked out power, Internet and phone service across the east coast. Nearly 8 million people were without power as of Tuesday.

- Google introduced new gadgets: The Nexus 10 will go head-to-head with the iPad. It has a 10-inch screen with higher resolution than the iPad. (But these screens are so good, the difference may be imperceptible to most of us.) And Google released new versions of the Nexus 7, the tablet to take on the iPad Mini. Google's Nexus 4 smartphone will also be available with the tablets on Nov. 13.

- Google's new devices will have the updated Jelly Bean operating system, which among other upgrades, has improved voice search. Google has also made this feature available in the Google Search app for iOS and it's proving to be a much faster alternative to Siri, going so far as to transcribe queries as users speak. There's also a new camera option called Photo Spheres.

- Microsoft says it sold 4 million copies of Windows 8since Friday's launch. For those that took the leap, be sure to check out CNET's list of the top 12 Windows Store apps.

- Searching for a show just got easier for Roku owners. A software update lets users search for a program across multiple services at once, incuding Netflix, Amazon Instant, Hulu Plus, HBO Go and Vudu.

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