A satellite returns the most precise global gravity maps

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Earth’s big pull

Google’s plans to buy mobile phone marketing company Admob are looked at by the Federal Trade Commission.

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Google’s Admob plans scrutinised

Did the Pong video game liberate women?

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Arcade classic

A 50-year old tradition has gone hi-tech as children track Santa via Google Maps, Facebook and Twitter.

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Military tracks Santa’s journey

The micro-blogging website Twitter says it is buying location tracking start-up Mixer Labs for an undisclosed sum.

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Twitter buys start-up Mixer Labs