Kevin... that is the one song of his that I have chosen as my way to remember him in appropriate singing situations. A couple of other folks have chosen other songs...(One lady sings "The Winnie-the-Pooh Rag")
   Once, at an FSGW meeting, I sat next to Jon and noticed that he was making odd little dots in his notebook, then crossing some of them out in odd patterns and drawing a line after the 'set' and starting a new set. I finally asked if this was some sort of 'solitaire' game with rules. He replied.. "Um..yes.. but it is pretty complicated to explain."

After we finished sorting out his apartment, I was given one of his notebook with a number of those games in it... along with notes about NASA meetings and various reminders to himself of questions to explore.

I have never found a source for an explication of the game. I will try to scan it and post an image in hopes someone will recognize it.