"Warwick’s robot is dependent upon biological cells, so it won’t live forever. After a few months, the neurons in its brain will grow sluggish and less responsive as learning becomes more difficult and the robot’s mortal coil begins to take hold. A sad thought perhaps — but such is life."
Researchers in the UK have constructed a robot with a "brain" made of real-life neurons. As the article explains, the robot brain adapts to, or learns from, sensory data gathered by a sonar device. This model could teach us a lot while it lives.