This Disc Makes Objects Invisible to Sonar [Sonar]

How do you make an underwater invisibility cloak? You start by creating a device that can manipulate sonar waves. This small cylinder, developed by researchers at the University of Illinois, does just that. More »

Source: http://feeds.gawker.com/~r/gizmodo/full/~3/bVUwS9LleqQ/this-device-makes-objects-invisible-to-sonar

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