Why do we eat popcorn at the movies, and when did that start? On my America Weekend show, I turned to an expert for answers: Andrew Smith, author of “Popped Culture: A Social History of Popcorn.” I asked him how profitable popcorn is for movie theater operators, why the business took a dip in the 1950s and 1960s, whether popcorn is as popular around the world as it is in the US, and more. Listen, then click here to subscribe to these podcasts via iTunes!

Warning: the music I used to begin this segment will be impossible to get out of your head, like the shell of a popcorn kernel stuck between your teeth with no toothpicks around.