' The currently accepted answer is the mass of a cylinder of platinum and iridium called the International Prototype Kilogram.

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Because of this, the actual International Prototype Kilogram (yes, there does only seem to be one in existence) is stored in a vault in Sevres, France, limiting the lay person's ability to determine the actual weight of a kilogram.

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The problem with that definition, of course, is that not just anybody can measure it -- since most of us don't have an International Prototype Kilogram laying around, especially since every time the thing is picked up a few atoms rub off of it making it a little bit lighter.

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The Joint European Torus (JET) is located in Britain, which is the largest such facility in the world and may be regarded as a prototype for the International Thermonuclear Experimental Reactor (ITER) based in France.

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He showed off a prototype last month at the International Consumer Electronics Show in Las Vegas.

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To test the idea, he and an international consortium of his colleagues have built a ground-based prototype.

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Perkins, writing in Boating International magazine, said he joined the project to take the Super Falcon from prototype to a fully functional craft.

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The screen is on show at the the FPD International Green Device 2010 trade-show in China, and is displayed naked alongside versions in a prototype "e-reader" and a small notebook.

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