A new invisibility cloak for sound could help hide submarines from enemy sonar. Getty ImagesFrom MSNBC/Discovery:
A new invisibility cloak for sound could help doctors find tiny tumors or hide submarines from enemy sonar.
"Our focus is not about dampening noise, but to guide sound waves around structures," said Nicholas Fang, a professor a the University of Illinois at Urbana Champaign and coauthor, along with Shu Zhang and Leilei Yin, on a paper that appears in the journal Physical Review Letters.
For example, "if we have a coating on a submarine that bends acoustics waves before they hit the surface, guiding them around the submarine smoothly, then you won't be able to detect a submarine using sonar."
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My Comment: Stealth subs ... it is only a matter of time.