"The popular notion of the ‘five-second rule’ is that food dropped on the floor, if picked up quickly, is safe to eat because bacteria need time to transfer”. Almost everyone has dropped some food on the floor and still wanted to eat it. If someone saw you drop it, he or she might have yelled, "5-second rule!" This so-called rule says food is OK to eat if you pick it up in 5 seconds or less.
However, the gastrointestinal system is pretty efficient at killing off germs, but you can never tell when a telltale salmonella bug is wandering around on the floor. It is found that salmonella can survive on the floor for weeks.
Better safe than sorry. Make it the no-second rule.
