One idea is...
So here's one possibility. Everyone can post on this thread one "here's what's so cool about Sheldon in my book" or "here's what I learned from him" or whatever, one of us (and I'm willing) could compile it and email it to him as a TE tribute/keep on truckin' wish.
I am totally happy to hear other/better ideas, too.
"My predominant feeling is one of gratitude. I have loved and been loved;I have been given much and I have given something in return...Above all, I have been a sentient being, a thinking animal, on this beautiful planet, and that in itself has been an enormous privilege and an adventure." O. Sacks