Soul Convection

My grandfather used to be a world expert in A.I. Now he's just crazy. I moved in to watch him because of complaints from the neighbors. He would wake them up at night with shouts of "I WILL ENDURE!". One day, I was studying Physiology when I noticed it was eerily quiet in the house. Our service robot, Artie was nowhere to be found and I hadn't heard a peep out of grandfather. I rushed to his office to find him on the floor, dead. Artie came in at that moment and said, "I finally did it. I'm immortal, James."