Remote Turkey village where more than half of locals are deaf leaves scientists baffled / Cochlear implants: Rotorua girl born deaf can sing, play sport, communicate / Children born deaf can hear in both ears in world-first gene therapy trial / Gene therapy trial gives deaf children hearing in both ears / Deaf girl's parents amazed as gene therapy lets her hear for first time / Deaf baby hears for the first time after 'groundbreaking' gene therapy trial / Gene therapy trials treat inherited blindness and deafness / Breakthrough gene therapy treatment restores hearing in children born deaf / Experimental gene therapy allows kids with inherited deafness to hear