After all the fake videos for those color blindness correction glasses, I'm skeptical of things like this.
It can't be for the first time. If you are born deaf, your brain doesn't generate the necessary neural connections to process speech. Sign develops the ability to process language, just not the audible sounds. When you hear a foreign language, you know it is speech even if you don't understand. This man was probably rendered deaf and the cochliar implant restored his lost speech. Still quite emotional.
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