What happens in your head when you read? Short answer: A LOT. From recognizing shapes as letters and words to discovery of empathy and new worlds, our brains really get a workout when we read books. Ben Bergen drops by to shed some light on how our brain processes the meaning of words. He runs the Language and Cognition Lab at UC San Diego. We also take a trip back to see how printing books has evolved and how the invention of the printing press brought worldwide change. And, Author Kelly Barnhill shares a little of what's going on in her brain as she's writing a story. All this and one of the best Mystery Sounds we've had to date.