It is one of the most overlooked inventions in modern science—a simple glass dish with a lid that quietly revolutionized the world. In this episode of *Dave Does History*, we explore the life of Julius Richard Petri, the man whose name lives on in labs and classrooms everywhere. From his work alongside Robert Koch to the dish that bears his name, Petri’s story is a reminder that sometimes the greatest impact comes from the simplest ideas. Join us as we examine how a small circle of glass became the launching pad for discoveries that still shape medicine and science today.

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