'Invisibility cloaks' could break sound barriers

Contrary to earlier predictions, Duke University engineers have found that a three-dimensional sound cloak is possible, at least in theory.

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<p><a href="http://www.physorg.com/news119097699.html">'Invisibility cloaks' could break sound barriers</a></p> <p>Contrary to earlier predictions, Duke University engineers have found that a three-dimensional sound cloak is possible, at least in theory.</p>