This unit guides students through the process of creating a sourdough starter and baking sourdough bread, while exploring the science behind each step. It includes a teacher presentation, step-by-step instruction sheets for both starter creation and breadmaking, and a student worksheet that reviews key scientific concepts and can be used as an assessment or quiz. Students will learn a range of scientific principles, including microbial symbiosis, alcoholic fermentation (yeast), lactic acid ferme