Re: Need a 4th and even a 5th law
From "The Duel" in Robots and Empire, the 0th Law:
0. A robot may not harm humanity, or through inaction allow humanity to come to harm.
1. A robot may not harm a human, or through inaction allow a human to come to harm, unless this interferes with the zeroth law.
2. A robot must obey orders given to it by a human being unless such orders interfere with the zeroth or first laws.
3. A robot must defend its own existence unless such defense interferes with the zeroth, first or second laws.
Setting up emergent behavior which leads inevitably to robots as our benevolent overlords.