Don't Drop That Turkey Leg: 5-Second Rule Unsupported by Science

When you were a kid, you might have heard a parent or sibling cite the "five-second rule" before swooping down on a piece of fugitive salami or a wayward grape. The basic premise is that once food is dropped on the floor you have a time limit of five seconds before it becomes unsafe to eat. The problem with the theory, according to microbial ecologist Jack Gilbert, is that it simply isn't true.

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