Realizing such a future poses immense difficulties, however, not the least of which is us. Human beings are wild and unpredictable. Robots, beholden as they are to the rules of their programming, do not handle chaos well. Any robot collaborating or even coexisting with humans must be flexible. It must navigate messes and handle sudden changes in the environment. It must operate safely around excitable small children or delicate older people. Its limbs or manipulators must be sturdy, dexterous and attached to a stable body chassis that provides a source of power. And to truly become a part of our daily lives, these mechanical helpers will need to be affordable. All told, it’s a steep challenge.