There are numerous incidents that we can’t believe in the world, so many people often suspect that it was behind on the incident, and then people feel interest in them. It is called “conspiracy theories”. Some people think that all incidents happen for a reason such as control and order of the government or mafia. People wonder why people usually seem to doubt it themselves. Some experts insist that is because it occurs when supply of information is less than demand of information. People think that some elite groups only control the information, so they have created new information themselves. People prefer more stimulant and interesting stories. Some conspiracy theorists insist that there are a lot of conspiracy theories now. For example,