I've said this Soo long ago and I was ridiculed for it.

I kept saying even while I was young that there is no way a person who is blind and deaf at birth is going to come to understanding of communication like we have today. Never. And that's because of perception.

I'm glad he did his research and proved his points . I never went into proving my point because I guess I was too stubborn and or lazy to prove something that to me at least was retarded and not possible.