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petri dish bracelet | silver Length:17 cm The mouth mirror appeared inpetri dish bracelet sterling silver In 1887, Julius Richard Petri was working as Robert Koch's assistant in Berlin. He took a flat glass dish, added a slightly larger glass lid, and published the design that became one of microbiology's most enabling tools. The container that made bacterial culture reproducible, contamination controllable, and finally a working science. The Science of the Petri Dish The Petri dish solved a specific lab problem: how to