STEM Robotics 101's Unit 1, Lessons 1 is called, "What is a Robot?" and seeks to draw out student's preconceptions of robots and explore the variety and ambiguity of "What is a Robot?"
The Primary Instructional Material is a simple PowerPoint, and the Differentiated Instructional Material contains 14 related resources contributed by registered teacher-users of the site (everything from a music video "Robots Need Love Too" to a very serious TED talk about robots in warfare).
The EV3 version of the course is here:
http://stemrobotics.cs.pdx.edu/node/2643?root=2643
and the NXT version here: