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Read more: https://www.cbsnews.com/news/no-holes-in-your-swiss-cheese-heres-why/
TIL: Some swiss cheese lacks holes because the milk used to make it is too clean. A Swiss agricultural institute discovered that tiny pieces of hay dust are responsible for the holes.
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Propionibacterium uses the lactic acid that is made by other bacteria, and it gives off a gas called carbon dioxide. This slowly forms bubbles that become the holes. The holes in the cheese are called the “eyes”, and a Swiss cheese that does not have holes is called a “blind” cheese.
Some of the holiest things are secretly dirty inside