TIL Upon losing his hearing, Beethoven devised a brilliant solution. By attaching a metal rod to his piano and clenching it between his teeth, he harnessed the vibrations in his jawbone, thus experiencing sound in a novel manner. This ingenious method is now recognized as bone conduction.
http://www.cnn.com/2014/05/29/tech/innovation/bone-conduction-get-used/index.html
