Nils Nilsson has died
Oh man... first Joe Armstrong, now this.  What a sad last few days.  :-(For anybody who isn't familiar with his life, Nils was one of the early pioneers in Artificial Intelligence. He was probably best known for creating the A* algorithm.https://en.wikipedia.org/wiki/Nils_John_NilssonR.I.P., Mr. Nillson.