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224 pages, Paperback
First published December 2, 1950


"If one and a half chickens lay one and a half eggs in one and a half days, how many eggs will nine chickens lays in nine days?"
“A good science fiction story should be able to predict not the automobile but the traffic jam.”
"Robots are essentially decent."
"But you see you, you can't distinguish between a robot and the very best of humanity."
"Since when is the evidence of our senses any match for the clear light of rigid reason?"
"I have spent these last two days in concentrated introspection" said Cutie, "and the results have been most interesting. I began at one sure assumption I felt permitted to make. I, myself, exist, because I think-"
"There is no Master but the Master and QT-1 is his prophet."


A robot may not injure a human being or, through inaction, allow a human being to come to harm
A robot must obey the orders given it by human beings except where such orders would conflict with the First Law
A robot must protect its own existence as long as such protection does not conflict with the First or Second Laws
The Three Laws of Robotics:
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 orders given to 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.