Yeah...and if one of the strings is flat, do they chill it out to sharpen its tone? There are semiconductors that do this -- they get cold if the current goes one way and hot if it goes the other -- but, honestly, I think this one will take off like a pregnant polevaulter.

In another few years they'll be able to load a piano up with micro-electro-mechanical devices (MEMS) that can do the job mechanically in either direction, which strikes me as a more sensible approach for pianos.

A