This prevalent five-second rule was disproved by Jillian Clarke, back then an American high-school student, and her colleagues when they conducted a scientific investigation in 2003. So the takeaway, as soon as the food hits the floor, contamination is likely to follow.
The five-second rule is based on the not-entirely-scientific belief that bacteria cannot contaminate food within five seconds, so you won’t get sick eating things you have picked up from the floor.
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