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http://www.news.cornell.edu/photos/nanomachines/nanogtr.GIF
 

 
The world's smallest guitar is 10 micrometers long -- about the size of a single cell -- with six strings each about 50 nanometers, or 100 atoms, wide. If plucked -- by an atomic force microscope, for example -- the strings would resonate, but at inaudible frequencies. Made by Cornell University researchers from crystalline silicon, it demonstrates a new technology for a new generation of electromechanical devices.Photo by D. Carr and H. Craighead, Cornell.The above image (508 x 327 pixels) is the digital image created by the electron microscope, and is the highest-resolution version available.