Youâ€™ve heard of the 5-second rule: anything that drops on the floor and is picked up within five seconds is still safe to eat. Students at Connecticut College ran an experiment to test contamination of foods dropped on the cafeteria floor.
The results: No bacteria were found on any food left on the floor for up to half a minute. Apple slices and Skittles both got germy after a minute (although one Skittle took five minutes).That doesnâ€™t mean I would recommend eating off the floor, no matter how fast you are. http://content.hamptonroads.com/story.cfm?story=124914&ran=137637 -via J-Walk Blog