These people believe in the Technological Singularity theory: The possibility that technologically augmented intelligence will change human life as we know it or possibly wipe it out completely.

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The deal, in theory, avoids the possibility of a imminent default on US payment obligations and lets Republicans off the hook.

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One possibility is that the amyloid theory is right, but that the Eli Lilly drug is flawed and did not hit the proper molecular target, and ended up merely causing toxicity.

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After hearing the theory, they shrugged and said they had already thought of that possibility a long time ago.

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And another is the possibility of home-school athletes having an unfair advantage because they could, in theory, tailor their school day around their training schedule.

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Rather than abandon the theory, scientists fell back on the notion that the data jibed with the possibility that rising carbon dioxide levels were reinforcing the warming trend in what's called a positive feedback loop.

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In spite of these misgivings, there is nothing in Einstein's theory of space, time and gravitation to forbid journeying into the past, a possibility that Einstein himself hated.

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