"Can a broken robot break a child?" they asked. "We would not consider the ethics of having children play with a damaged copy of Microsoft Word or a torn Raggedy Ann doll. But sociable robots provoke enough emotion to make this ethical question feel very real."

"The concept of robots as baby sitters is, intellectually, one that ought to appeal to parents more than the idea of having a teenager or similarly inexperienced baby sitter responsible for the safety of their infants," he writes. "Their smoke-detection capabilities will be better than ours, and they will never be distracted for the brief moment it can take an infant to do itself some terrible damage or be snatched by a deranged stranger."

"What if we get used to relationships that are made to measure?" Turkle asks. "Is that teaching us that relationships can be just the way we want them?" After all, if a robotic partner were to become annoying, we could just switch it off.

We've reached a moment, she says, when we should make "corrections"—to develop social norms to help offset the feeling that we must check for messages even when that means ignoring the people around us. "Today's young people have a special vulnerability: Although always connected, they feel deprived of attention," she writes. "Some, as children, were pushed on swings while their parents spoke on cellphones. Now these same parents do their e-mail at the dinner table." One 17-year-old boy even told her that at least a robot would remember everything he said, contrary to his father, who often tapped at a BlackBerry during conversations.

After spending much of an hour trying to describe the Italian Renaissance to a classroom of North Korean defectors — "Can you imagine where Italy is?" — and having to stop to explain what she meant by "far," one teacher at the Yeomyung School said reunification would be tough.

"The reason that she was tortured was that her children had escaped,"