In 2002, the Magna Science Centre in South Yorkshire witnessed a surprising event: a two foot tall robot, Gaak, escaped from a gladiatorial experiment with learning robots.  The experiment, part of the “Living Robots” project, simulated a predator and pray scenario where some robots searched for food (prey) and others hunted for them (predators).  Gaak, a predator, was left unattended for fifteen minutes and, in that time, managed to find and navigate along a barrier, find a gap, move through it and continue across a car park to the M1 motorway. Gaak was found rather quickly when a motorist almost collided with it.  This story of robot liberation helps us to understand a simple fact about learning machines: they are unpredictable.   …