When he built the Difference Engine, this route was not available he said.

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Some alternate-history novels have envisioned a separate Texas, notably 1990's "The Difference Engine" by William Gibson and Bruce Sterling, which explores what might have happened to the world had computers been perfected in Britain a century earlier.

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David Pickavance, from Penrhyn Castle Railway Museum, said there was a big difference between a museum engine and a working one.

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The difference is that the vertical engine drills down and down into the data and provides an ordered experience: say, on travel, or certain kinds of shopping.

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The engine is the biggest difference.

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The difference is that the huge screen and wicked fast Java engine make this phone a pleasure to play games on.

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Microsoft has invested heavily in its Bing search engine but that has not yet made a significant difference as Microsoft tries to compete with Google and Facebook for consumer mindshare.

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The difference between turbocharging and supercharging is simple: a turbocharger boosts engine air pressure by using exhaust gas to power a turbine that pushes more air into the combustion chamber.

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