Unfortunately, there is no evident basis for assuming that the esoteric, and in any event dubious, theory of mutual vulnerability will serve to deter emerging threats like that posed by Iraqi-sponsored terrorists armed with Mr. Hussein's chemical weapons.

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Theory predicts this event ought to be "imprinted" in the CMB and the detail should be retrievable with sufficiently sensitive instruments.

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One theory is that a cooling event at the end of the Eocene dried up swamps and rivers, forcing animals out on to the land.

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This crisis begins, in classic chaos-theory fashion, with a trivial event along the 100-mile railroad track that moves most coal out of the Powder River Basin.

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These professionals use mathematics, statistics, and financial theory to assess the risk that an event will occur and to help businesses and clients develop policies that minimize the cost of that risk, according to the Bureau of Labor Statistics website.

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The black swan theory was developed by Nassim Taleb to describe an event that is a complete surprise, has a major impact, and after the fact is rationalized with the benefit of hindsight.

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The U.S. could, in theory, disable or deny access to the system by others in the event of a conflict, although it says it never has done so in the past.

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Using one of the oldest methods to discern the direction of the Dow, Richard Moroney, editor of Dow Theory Forecasts notes that the new high in the industrials is by definition a bullish event.

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