Image of the chip containing six mass-spring systems (i.e. six tones). (Credit: Image courtesy of University of Twente)
From Science Daily:
ScienceDaily (Sep. 29, 2010) — Strings a fraction of the thickness of a human hair, with microscopic weights to pluck them: Researchers and students from the MESA+ Institute for Nanotechnology of the University of Twente in The Netherlands have succeeded in constructing the first musical instrument with dimensions measured in mere micrometres -- a 'micronium' -- that produces audible tones. A composition has been specially written for the instrument.
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