about him. and we just know that trapped in this body that he can't use is this quite brilliant brain. and there is something about that that is such a powerful and poignant image. it just seems to touch people. >> larry: thank you both very much, john smithson and ben bowie. the second part of this special will air sunday on discovery. we'll be back. we'll talk with stephen hawking and we'll meet an expert panel as well. stephen hawking in his own words, next.