A robot may not injure humanity, or, through inaction, allow humanity to come to harm.

A robot must protect its own existence as long as such protection does not conflict with the First or Second Laws.

Don't you believe in flying saucers, they ask me? Don't you believe in telepathy? - in ancient astronauts? - in the Bermuda triangle? - in life after death? No…

A robot must obey the orders given it by human beings except where such orders would conflict with the First Law.