Abstract: An example of game in the theory of games is as follows : A player has to chose between sending zero message about a research or 15 messages; the outcome in the second case is zero reply with a probability of99%. The player chose to send 15 messages. The absence of any gain in any case is the bad luck.(definition) It may be because people are extremely specialized, .in our Age or it may be because people do not want to make great efforts or they are already very busy with things which will not pass to posterity.

Key words : “Adib Ben Jebara