Preserving food may seem like an everyday convenience, but for centuries it was a constant challenge. Before refrigeration, natural ice was a valuable resource that was even transported across continents. This episode traces the chain of developments that made it possible to control cold—from the ice trade to the scientific breakthroughs that enabled mechanical refrigeration. As these innovations come together, they transform not only food consumption but also medicine, industry, and urban life. A story in which mastering temperature led to a profound shift in the way we live.