For the most part most data centers are operating in the pre-virtual world, in which the pace of change is governed by the rate at which physical servers can come and go.

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They were collected primarily through police reports in 2007, death certificates and the number of fatalities registered by the Not-in-Traffic Surveillance system, a virtual data collector of details regarding nontraffic crashes nationwide.

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They may even realise that they no longer need to make cars at all, deciding to follow the example of Cisco Systems, a data-networking firm, by becoming virtual companies whose expertise lies in design and brand marketing.

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Now we create interactions and co-locate people and retailers in virtual space counting megabytes of data instead of millions of square feet.

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The Esa said it was not interested in the features drone owners designated as their virtual docking port - it wanted to gather data only about the way humans navigated the robot craft.

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Implenia's engineers could use that virtual world mock-up to remotely track the data center's power consumption and efficiency in ways that would have otherwise been tough without visiting the location.

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