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You haven't heard it all

Experimental cloak makes objects sound like they aren't there

By
10:07am, June 30, 2011

A new cloak that hides objects from sound could really confuse a bat trying to echolocate in a cave. Sound waves striking a bump covered by the cloak bounce back as if they hit a flat wall instead.

This sound-bending trick could smooth out the acoustics of concert hall walls. If adapted for water, it might also be useful for hiding submarines from sonar.

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