One way to increase the efficiency of a high-bypass jet engine is to turn the fan into an open rotor, a bit like returning to propellers, but using two rings of stubby counter-rotating blades.

ECONOMIST: A new way to build a greener jet engine

Both BA and KLM, after all, had direct experience of what flying through volcanic ash can do to a high-bypass turbofan jet engine.

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In the case of Famo.us, the innovation has been to bypass the webkit render engine by writing a new, higher-performance engine.

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If you could bypass the laborious process of doing repetitive search engine optimization work to rank higher in organic search results, would you do it?

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The other possibility is to increase bypass, or the amount of air the fan on the front blows past the engine.

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In Greece, the region's only member of the European Union and its natural engine for economic development, there is a strong feeling that redevelopment cannot bypass Serbia.

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However high-bypass engines are built in the future, at their core they will still have a basic jet engine.

ECONOMIST: A new way to build a greener jet engine