Or suppose a robot must deal with individuals of two widely different species, each manifestly intelligent. Even if he understands both sets of languages, must he be forced to decide which of the two is the more intelligent before he can decide what to do in the face of conflicting orders-or which set of moral imperatives is the worthier?

Someday, this may be something I will have to take up in a story but, if so, it will give me a lot of trouble. Meanwhile, the whole point of the Robot City volumes is that young writers have the opportunity to take up the problems I have so far ducked. I’m delighted when they do. It gives them excellent practice and may teach me a few things, too.