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Theory suggests Stonehenge built to duplicate a sound-based illusion | The Raw Story.

Scientists have known for a long time that sound waves coming from opposite directions can cancel each other out, creating areas of relative quiet. This is not just a laboratory effect, but can be observed, for example, if two pipers play their pipes as they walk around a field.

Now an acoustic researcher has theorized that the unusual layout of the ancient uprights at Stonehenge was designed to mimic this effect.