1 - A robot may not injure a human being, or,
through inaction, allow a human being to come to harm.
2 - A robot must obey the orders given it by human beings
except where such orders would conflict with the First Law.
3 - A robot must protect its own existence as long as
such protection does not conflict with the First or
Second Law.
-- The Three Laws of Robotics
-- Isaac Asimov," Handbook of Robotics, 56th Edition, 2058