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It's spelled, "Petri", and you put a petri dish on a level surface, otherwise the growth medium might spill out. The level surface could be a sterile box, a regrigerator, or just on a work counter.

Then, if you dropped bread crumbs on the bacteria growing in your petri dish, and if those bread crumbs happened to have a little blue bread mold on them, and you noticed that the bread mold killed the bacteria, then your name might be Alexander Fleming, who is credited with discovering antibiotics.

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15y ago

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