An Iranian researcher has invented the world’s tiniest capacitor microphone that can be used in making small and invisible hearing aids. Bahram Azizollah-Ganji, a faculty member of Noushirvani University of Technology in the northern city of Babol, has built a very small microphone which is only 0.5 x 0.5 mm big. The device, which is the tiniest microphone in the world, is mainly developed for...