If you ever wanted to dupe an enemy sonar (or a whale), a new tool that fools sound waves into thinking they’re hitting nothing but thin air is for you. The cloaking device, paid for by the US military, is a mathematical marvel of engineering.
The simple toy, a little bigger in diameter than an iPad, and which looks like lightweight sheets of plastic stacked together to form a sort of Mayan pyramid with tiny holes, acts as if sound passes right through it and whatever it hides inside. It works with sound coming from any angle, and does its magic by rerouting the sound waves to avoid collision with hard matter. Continue reading “‘In one ear, out the other’: New cloaking device makes hidden objects completely inaudible”

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