These crystals generate an electric field when squeezed or stretched by sound waves or other forces, and deform in an electric field. When a sound wave reaches the edge of one crystal, the electric field associated with it can stretch across the gap and deform the crystal on the other side, creating sound waves in that second crystal. "It is as if the sound waves don’t even recognise the vacuum – they just go through," says one of the researchers.
Fanciful stuff right?
They are about to change the course of history with their discovery~!
Oh wait, I thought I have seen it before.
Well, the concept is nothing new, it is how our radio works. A radio station transmits sound waves which is then converted to electromagnetic waves. These electromagnetic waves are then picked up by the antenna of your radio, and your radio converts the electromagnetic waves to sound waves. Simple.