Yeast!

He may not have looked like he was paying attention, but Pauly did learn in the yeast class at YEA today. On the way home Roger wanted to drink the root beer, but I told him that we had to wait a few days for the yeast to eat the sugar and make carbon dioxide. Then Pauly said, "And make more yeast, then even more carbon dioxide." A little later, when asked, he told me that the yeast eats the sugar in dough to make carbon dioxide to make bread rise.