Cheddar cheese is usually labeled according to its "sharpness." Dr. Michael Tunick, author of "The Science of Cheese," explains the reason for this flavor grading. Here is a transcript of the video.

Any experienced cheese grader knows cheeses can sneak up on you. This was one of the many lessons Gina Accorsi learned over the last year, as she embarked on a career in cheese grading at a dairy ...