In case anyone cares (since we are on the subject of Terminator 4 today), this is the type of nano technology that would be employed. As you can see, it could theoretically be used for many other things as well.
-S
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Utility Fog is basically a 'Fractal Robot', made up of trillions of smaller bots, like the polymorphic liquid metal Robot in the movie Terminator 2.
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Some of the basic properties of Utility Fog would be invisibility (when desired), strength, and enormous computing power. Molecular size means too small to see, and in low density formations (arms extended to maximum) it would flow easily as air. Speed? At molecular sizes, robots would move interactively at about the speed of sound, almost faster than we could see. The strength of a swarm of molecular sized robots would be amazing... if desired as hard as cement, and in unison could lift a truck with ease!
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Read on here - http://www.pivot.net/~jpierce/utility_fog.htm
There are also plenty of other sites on the net that explain utility fog in more detail.
The most pressing site (Dooms day site) however that explains the dangers of Nano Tech can be found here - http://www.crnano.org/
-S