There are going to be court cases about this sort of thing in the near future, mark my words. What happens when an artificial heart becomes smarter than its recipient? Who is in charge? This is why you need to eat heart-smart and kill all AI constructs on sight.

These are the sorts of thoughts that keep me from sleeping peacefully at night. That and the inherently ironic ghost of Carl Sagan, who keeps appearing to me at the foot of my bed and offering me smokes.