The first use of the word "robot" was in what year: 1921. A robot can only do what it is programmed to do: True. "Actuators" look like:: all of the above. What is an "end effector": a tool attached to the end of a robotic arm. What are the 2 types of sensors mentioned in the ebook: infrared and ultrasound. Wheeled robots often have trouble getting past objects in their path: True. The more legs the robot has, the less stable it becomes: False. What does "autonomous" mean: the robot can move on it's own. What is "artificial intelligence": programming robots to think like people