But it wasn't known whether the trigger was mechanical ventilation or early inflammation due to gestational age, the authors of the latest study said.

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In 1990, the Supreme Court ruled that software was, indeed, patentable, but only in the context of some mechanical entity, whether it be a steel plant, a computer system or even (unbelievably) a CD-ROM disc.

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"It would be nice if you could do that but I'm not sure it would work - it depends whether it is a simple mechanical component or something more complex, " Prof Pillinger, who now works at the Planetary and Space Sciences department at the Open University, told BBC News.

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The second pilot, unsure whether his colleagues were taking fire or experiencing mechanical problems, ditched his plan to hover over the roof.

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The result is a seasonal strategy that allows whatever is going on at the time, primarily whether the market remains in rally mode or not, to influence the entries and exits, while maintaining the mechanical aspect that avoids usually wrong emotional input.

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