Wayne Angell, who was a governor of the Federal Reserve from 1986 to 1994, devised a system that involved tracking the changes in the prices of 21 commodities over a rolling 52-week period.

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This is possible because virtualization makes cloning software very easy, and Networked Attached Storage devices have extremely sophisticated ways of making virtual copies of large amounts of data and then tracking the changes between the two copies, which saves massive amounts of storage.

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The Raytheon editor is just one of several caught sanitizing corporate histories or smearing rivals since Virgil Griffith, a graduate student at Caltech, released a Web tool capable of tracking the source of changes on Wikipedia.

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Users can also sign up to get a free daily newsletter tracking media news and staff changes.

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Rems has also been tracking the hourly and daily changes in air pressure.

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And Dr Hameri is optimistic that the information that Single Source provides could prove useful for planning and tracking even more complex phenomena, such as major organisational changes.

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Customers can contact the Association of British Insurers where details of some of the common name changes are kept and are therefore helpful in tracking down companies that have taken over policies.

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The Powershares DB Commodity Index Tracking Fund ( DBC) is a widely followed and liquid ETF that tracks the changes in the Deutsche Bank Liquid Commodity Index.

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But Department of Energy is tracking that very closely, working with the states and utilities, and putting that number together as it changes through the days.

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