You’ve heard of optical illusions, right? Did you know that our ears can be fooled just as much as our eyes can? In this week’s chapters you learn about ways that our brain uses to make sense of the mind-boggling stream of noise that reaches our ears almost continuously. In the two activities I have chosen for you to do this week, you get a chance to see and actually experience the bizarre “McGurk Effect.” This is one that you have to actually do it yourself to believe! I also have posted for you Part I of a series of psychoacoustic illusions.