The first one-way acoustic isolator lets you listen in without being heard

Researchers at the University of Texas at Austin are reporting that they’ve built the first ever one-way acoustic device — a device that lets you hear something, without being heard in return. This breaks a fundamental rule in physics, called time reversal symmetry, that stipulates... -
The first one-way acoustic isolator lets you listen in without being heard http://goo.gl/t24Q6O

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