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Another application of nanotechnology is utility fog, in which a cloud of networked microscopic robots (simpler than assemblers) changes its shape and properties to form macroscopic objects and tools in accordance with software commands.Rather than modify the current practices of consuming material goods in different forms, utility fog would simply replace most physical objects.

Most people believe that virtual reality will not much reduce interest in obtaining limited resources, such as a chance to talk to the real president of a major country, or owning part of the real Jerusalem, or having a famous celebrity say nice things about you in a digitally-signed document, or gaining the mining rights to the larger near-earth asteroids.Some imagine that money would cease to be of use and taxation would cease to be feasible.Others conjecture that nanotechnology would elicit a strong public-opinion backlash, as has occurred recently around genetically modified plants and the prospect of human cloning.Nanotechnology could therefore offer much cleaner manufacturing processes than are available with today's bulk technology.The first mention of nanotechnology (not yet using that name) was in a talk given by Richard Feynman in 1959, entitled .Physically, real nanotechnology relates to sizes of only a few atoms' width.

Implementing nanotechnology in its fullest sense would require the ability to directly manipulate atoms or molecules via mechanosynthesis.

Whilst progress has been made in producing ever-smaller computer circuits and nanowires, and manipulating individual atoms, constructing real nanomachines is currently well beyond our present capabilities and is widely believed to be decades away.

Critics doubt that controllable self-replicating nanobots are possible at all, citing the possibility of mutations removing any control and favouring reproduction of the mutant pathogenic variations.

As a result, when we cause a particular chemical reaction, we frequently get a mix of several different product species.

The reaction is often followed by a physical filtering process to extract the species we actually wanted, with the other species discarded as waste.

Specifically, the inputs to any such manufacturing process would be raw materials, energy, design software, and time.