Great scientific mind and tough life physically. Not that it matters much but he was an atheist so I'm not sure R.I.P. is the quite the terminology to use although I realize it is used very generically irrespective of beliefs in many cases but it has Christians roots and alludes to an afterlife. At any rate, it is amazing that despite his physical challenges what he was able to accomplish scientifically and publicly. And, I do like his quote "It would not be much of a universe if it wasn't home to the people you love."