A teaching assistant at Georgia Tech was actually an artificial intelligence.

By the end of the semester, "Jill" was reportedly answering questions with a 97 percent success rate, having learned to parse the context of queries and reply to them accurately. As Korn writes, students apparently hadn't suspected anything was unusual about the helpful interlocutor, and at least one claims he was "flabbergasted" when he learned its true nature. Goel apparently plans to repeat the performance next semester and says that he'll give his creation a new name to extend the fun (though presumably his next batch of students will having an easier time distinguishing real from fake).