The first method is through offering what seems to be a surplus of opportunity without very much risk.

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Our point is not -- I said this a week and a half ago -- our point is not to feign through method acting anger at what environmental and economic damage has been wrought by this disaster.

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Next time a volcano threatens the air lanes, then, Dr Bennett's method may provide valuable illumination of what is happening, and thus enable airliners to steer safely through what might otherwise ground them.

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