"Do things, but do not cause harm to anyone or hurt anyone knowingly."
That is the Tiny Robot's one logic, pressed into an old brass plate on its brow. It also knows that trees and plants are living things, so it will not hurt them either. In Gridhaven, a city of robots built for speed, wins and applause, that makes it slow, careful and, most robots say, obsolete. Before every step it stops, looks left, looks right, and says: "Check... no harm. Go."
