Why does Swiss cheese never grow mold?

That's a fun myth! Swiss cheese actually can grow mold, just like any other cheese.

The reason Swiss cheese *appears* less prone to mold is because of:

* The holes: The large holes in Swiss cheese, created by the bacteria that produce carbon dioxide, allow for better air circulation. This reduces the moisture trapped within the cheese, which is a key factor in mold growth.

* The acidity: Swiss cheese has a naturally acidic pH, which inhibits the growth of many types of mold.

* The rind: The rind of Swiss cheese is often treated with a protective coating that helps prevent mold growth.

So while Swiss cheese isn't immune to mold, its unique properties help it stay fresher for longer.