Why does Swiss cheese look like that? What's with all the holes? It turns out, those holes are key in making cheese Swiss! Dr. Michael Tunick, author of "The Science of Cheese," explains what goes ...

With its mild, versatile flavor, Swiss cheese is right up there with everyone’s favorites. The fun holes don’t hurt, though we have to wonder: Why does Swiss cheese have holes at all?

These bubbles become trapped in the cheese rind and form holes (also known as eyes). The size of Emmentaler wheels is heavily regulated, as most have a diameter of 80 to 100 centimeters.