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SoundBug
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<h2 id="external-links">External links</h2> <ul><li><a href="http://www.feonic.com/">Soundbug Whispering Windows and Invisible Speakers from FeONIC</a></li> <li><a href="http://www.whisperingwindow.com">Whispering Windows website</a></li> <li><a href="https://www.youtube.com/watch?v=o_15Rb6weV4">YouTube video showing Whispering Windows and SoundBug in action</a></li> <li><a href="http://news.bbc.co.uk/2/hi/science/nature/1879247.stm">Bug sets windows shaking</a>, BBC, 18 March 2002</li></ul>