Scientists at the Bell Laboratories in USA have developed a tiny, pyramid shaped microphone directly on a silicon chip. This microphone is about 100 micrometres in size. The researchers have built a minature radio-frequency filter (like those used in cell phones) and another component called an inductor. The three components can all be built on a single chip which will lead to a tremendous saving in weight and size for communication equipment.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/small-talk
[2] http://admin.indiaenvironmentportal.org.in/category/author/mario
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/down-earth
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/physical-science
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/technology
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/research
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/united-states-america-us
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/telecommunication