Reversed echoes may fight disease and foster communication
Imagine descending into an Alice-in-Wonderland canyon where the echo that returns when you shout "hello" sounds like "olleh." No such sound-reversal canyons exist in nature. However, physicists in Europe and the United States have recently been creating environments in the laboratory and underwater that exhibit reversed echoing. Instead of actual walls, from which only run-of-the-mill echoes would
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