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Nanocomputer is the logical name for a computer smaller than the microcomputer, which is smaller than the minicomputer. (The minicomputer is called "mini" because it was a lot smaller than the original (mainframe) computers.) More technically, it is a computer whose fundamental parts are no bigger than a few nanometers. For comparison, the smallest part of current state-of-the-art microprocessors measures 65 nm.  No commercially available computers that are named nanocomputers exist at this date, but the term is used in science and science fiction.
There are several ways nanocomputers might be built, using mechanical, electronic, biochemical, or quantum technology. It is unlikely that nanocomputers will be made out off semiconductor transistors (Microelectronic components that are at the core of all modern electronic devices), as they seem to perform significantly less well when shrunk to sizes under 100 nanometers. 
- Starseed launcher - Interstellar nanoprobes proposal
- List of fictional computers in the 1980s - Low Energy Variable Input Nanocomputer (LEVIN) from William T Quick's novels Dreams of Gods and Men, and Singularities. (1989)
- Quantum computer
- ^ 65 nanometer. Retrieved November 23, 2006.
- ^ Ellenbogen, J.. (1998). A Brief Overview of Nanoelectronic Devices. Retrieved August 3, 2006 from http://www.mitre.org/tech/nanotech/ourwork/nano_papers.html#nanoelectronics
- Wired News: Nanocomputers Get Real - Article about the first molecule-sized transistor.
- A spray-on computer is way to do IT
- Future Nanocomputer Technologies - Diagram of possible technologies (electronic, organic, mechanical, quantum).
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