Photo: Acoustic "Invisibility" Cloaks Possible, Study Says

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Sound waves—pictured in this simulation moving from left to right&#&8212;would bend around an object cloaked in a theoretical material—pictured here in green—that scientists say is possible.

After passing over the acoustic "invisibility" cloak, the waves would resume their original courses, said Steven Cummer, the lead author of a study published this month.

Image courtesy Steven Cummer/Duke University

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