I'm not saying one can't be smart/intelligent without being able to see/hear, I'm saying if you take away all senses from ALL human beings there won't be any way to communicate at all, or know that others exist, and to learn from them. Learning is what makes intelligence possible--and the passing of information through generations. Hellen Keller fought extremely hard to overcome her sensory issues, but she had a good teacher, who presumably had someone else help them or guide them some. -- But to organically learn to speak when nobody can hear you, or to read when you can't even feel the braile, etc..would be nearly impossible.