Beer, the film argues, is not a party favor but a hinge of human history. Scientists and historians trace the drink from Neolithic farmers who may have domesticated grain for fermentation before bread, through Egyptian workers building the pyramids on daily beer rations, to medieval monks who kept brewing alive as a source of safe drinking water and monastery income. Interviews and reenactments walk through the invention of pasteurization and refrigeration, both developed in part to solve brewing problems, and the way beer money and beer taxes helped fund colonial ventures and the American Revolution. The film also credits beer with side effects most people never connect to it, from the spread of glassmaking to advances in microbiology once Louis Pasteur started studying yeast. Told with a light, pub-trivia tone rather than a dry lecture, it strings together archaeology, chemistry, and economic history into one continuous case that a fermented grain drink shaped how humans built cities, traveled, and organized labor.