Why does Swiss cheese have holes? It’s been the subject of great speculation throughout the years but researchers in Switzerland (where else?) think they have the answer. Agence France-Presse, via The Guardian, reports that researchers at a state-run agricultural research center called Agroscope have determined that tiny hay particles that fall into the milk are the main reason Swiss cheese develops holes. Previously, research suggested the holes were caused by carbon dioxide released by bacteria, but that’s apparently not the case.
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