Why are there holes in Swiss cheese?

Have you noticed that there’s a kind of cheese that’s holier than all the rest? Swiss! Why does it have all those holes anyway? We asked Jenny Eastwood of Small Goods to help us answer this delicious question. Hungry for some answers? Send your questions to BrainsOn.org/contact , and we’ll brie pare an answer justfor you. See omnystudio.com/listener for privacy information.