Professor reveals to students that his assistant was an AI all along

Artificial intelligence: students were surprised to learn they had been dealing with a bot all semester. To help with his class this year, a Georgia Tech professor hired Jill Watson, a teaching assistant unlike any other in the world. Throughout the semester, she answered questions online for students, relieving the professor's overworked teaching staff. But, in fact, Jill Watson was an artificial intelligence bot. Ashok Goel, a computer science professor, did not reveal Watson's true identity to students until after they'd turned in their final exams.