Ah I see, you are referring to the popular notion that food is still safe to eat if it has only been on the floor for 5 seconds or less. This "5 second rule" is more of an informal myth than a scientifically proven fact. While brief contact with floors may reduce the risk of contamination compared to longer periods, research shows that harmful bacteria can transfer to food very quickly after dropping. A study by Illinois State University researchers found that bacteria like E. coli can contaminate foods in less than a second.
So while the "5 second rule" is an amusing idea, it does not guarantee food safety. The risks of contamination are significant enough that most food safety experts do not recommend relying on the 5 second rule, and instead advise properly washing or disposing of dropped food.
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