The word “robot,” like the words “shalom” and “free-range chicken,” does not have a universally agreed-upon definition, but the usual criteria include autonomy, an ability to change its surroundings, intelligence, and the possession of a body. Then it gets trickier: How intelligent? Must a robot be mobile? Is a dishwasher a robot? According to the podcast “Robot or Not?” a self-driving car is not (you designate its destination), but a Roomba is (because it’s more in control of its path than you are).