Bread rises because biology creates gas and a hydrated protein network holds it. Discover how yeast fermentation, gluten development, proofing, and oven heat work together, why dough can be both elastic and extensible, and what a collapsing or dense loaf reveals about structure and timing. Inside this episode: - How yeast converts available sugars into carbon dioxide - Why hydrated gliadin and glutenin form gluten - Mixing, kneading, folding, and gas retention - Proofing, oven expansion, and setting the crumb - What common bread failures reveal about the system Sources include American Chemical Society educational material, Institut Pasteur history, university food-science publications, and extension guidance. This episode is a researched narrative summary. Historical records may be incomplete, translated differently, or interpreted differently  ...