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WkVmd TIL Ludwig van Beethoven, who was almost completely deaf, discovered Bone Conduction. Beethoven found a way to hear the sound of the piano through his jawbone by attaching a rod to his piano and clenching it in his teeth.
XEk0E TIL that after Ludwig van Beethoven went deaf, he found he could attach a metal rod to his piano and play while biting on it: this enabled him to hear through vibrations in his jawbone. This process is called bone conduction