🍞 Turn sourdough into a full food science investigation! This 14-page printable unit takes students beyond “just bread” and into the real science of fermentation. Students explore how yeast and bacteria transform flour into a living system, and then apply their understanding through writing, modeling, and hands-on exploration. NGSS Connections: Supports key concepts from MS-LS2-3 (matter cycling in systems) and MS-PS1-4 (particle motion and thermal energy) through real-world fermentation. Wh