Interesting! I'm one of the people who has mild face-blindness (the subject of the "mistook his wife for a hat") and there are some pretty funny articles about people who are affected by that, but when it's severe (mine is not) it can be very, very difficult. People aren't able to recognize their own family members (my problem is photographs and movies). I can't imagine what it would be like to not recognize words. And what an amazing solution he came up with. Thanks for sharing this.