http://www.bugsweeps.com/info/bugsweepers.html
Perhaps the most sneaky of all bugs is the passive device. It first came to light some years ago when American security experts revealed that they were worried about low-level microwaves beamed by the Soviets at the American embassy in Moscow. Now they’re reasonably sure that these were aimed at mysterious cavities built into the structures of the buildings.
Steel reinforcing rods or small cone-shaped metal cavities can be hidden in the walls during construction. Sound waves within the room cause the walls to vibrate slightly, distorting these metal structures. If a microwave beam at a critical frequency is aimed at such a device, the reflected signal is slightly modulated by the sound vibrations. Careful analysis of the returning reflections can re-create the original voice signals that caused the vibration.
I have a new name for Mika.
When we were young, our Greek mother had a name for a piece of snot: phonetically pronounced: Meek-sa.
Meeksa. Fits Mika very well.