3 seconds rule

Do you know "3 seconds rule"?
I have necer seen people who know this rule except Japanese.
This is a kind of jokes that when we drop something to eat, we can still eat until 3 seconds.
Then, I wondered why it is 3 seconds and I found interesting data.
There was the data which studied "3 seconds rule" very seriously in U.S.A.
An experiment performed in U.S. University of Illinois in 2003 by Gillian Clark who was a twelfth grader in those days.
Clark left silverberry candy and a cookie on the floor where she sowed a colon bacillus in and checked the adhesion situation of bacteria of every elapsed time with a microscope.
By the way, "five seconds rule" seems to be the mainstream in U.S.A.
As for the experiment, it was carried out an environmental condition in spite of being various cases substitute. As a result, regardless of the shape of the floor and the kind of the cooking ingredient, the adhesion of a great deal of bacteria was accepted for a short time equal to or less than five seconds.
Therefore this rule was a howler was demonstrated some other time.
In addition, by this experiment, there is not bacteria itself on the dry floor very much, and the safe as such is located even if we eat the food which we dropped.
However, after all, as for eating the cooking ingredient which fell, we should not eat because it is not the various germs situation of the floor thing examined one by one.
Anyway, Ig Nobel Prize of 2004 is conferred on this experiment that showed a tentative end to world "three seconds rule".
Until reading this article I used to do that, but I should quit this habit soon!