We spoke to author and physicist Aaron Santos about his new book, How Many Licks. Have you ever wondered how many calories are in the Stay Puft Marshmallow Man? How many licks it takes to get to the center of a Tootsie Pop? How long it would take to dig your way to China using a spoon? Aaron knows. Approximately. And on Speaking Up we discuss the merits of paper vs. plastic with Naomi Baker.