 Becca is a computer program that acts as a brain for robots. It listened to the Hobbit for two days and learned the types of sounds that the narrator made. The bodyguard of Bulg came howling against them and drove in upon their banks like waves upon cliffs of sand. It also learned to predict what sounds were about to happen. Then Becca listened to a different part of the story, this time with sound effects mixed in. The sound effects didn't match what Becca expected to hear. It was able to find them, even though the narration was unfamiliar too. Figuring out when a sound or object is unusual is hard for robots, but being able to do that will help them understand speech and learn about the world on their own.