Yeast Matters

"All breads contain yeast," the person in front of me declared. "No, I don't think so," I managed to say with a straight face while hiding incredulity from my voice (at least I hope I did). My friend sitting beside me expressed his agreement. I tried to explain further that there were other leavening agents aside from yeast such as baking soda and that other kinds of bread aren't leavened at all. Surely this person has heard about unleavened bread? Well, apparently not for he was vigorously shaking his head and muttering that…