A nice video that runs for approximately 24 minutes is called the Story of Pi and is produced by the California Institute of Technology by Project Mathematics!. The number for the California Institute of Technology is 818-356-6345. A program guide/workbook come with the video. I hope it will be of benefit to your classes. A number to purchase the material is 818-356-6161, which is Caltech's Bookstore in Pasadena California. Your state collaboratives may already have the series, which may be loaned out. I hope you enjoy the video as much as ice cream and apple pie.