There are types of stories called “conspiracy theories” and the people who teach them are considered by society as crazy fanatics who often need medical treatment. You may not believe in conspiracy, but some of them actually turn out to be true.

SEE ALSO: Conspiracy theories that turned out to be true

This list contains 10 of the most popular conspiracy theories. Could it be possible that they might be true? We’d like to know your opinions so please share them in comments.

#1 The Fluoride Conspiracy

It’s a commonly known fact that fluoride is added to water in order to sterylize it, but there are those out there who believe there are more harmful effects being ignored in order to aid the pharmaceutical industry. They said fluoride is purposely added to public water supplies to ensure a docile population!

#2 JFK Assassination

The circumstances surrounding the assassination of former president John F. Kennedy and who was REALLY behind it has been debated and analyzed since the tragedy occurred on November 22, 1963. Many believe there is no way only one man could be behind it and that Oswald wasn’t acting alone.

Most current theories put forth a criminal conspiracy involving parties as varied as the CIA, the Mafia, anti-Castro Cuban exile groups, the military industrial complex, sitting Vice President Lyndon B. Johnson, Cuban President Fidel Castro, FBI director J. Edgar Hoover, the KGB, or some combination of those entities.

#3 9.11

Some believe that government officials were warned of the impending attack and did nothing to stop it. Proponents of these conspiracy theories claim there are inconsistencies in the official conclusions, or evidence which was either ignored or overlooked.

The most prominent conspiracy theory is that the collapse of the Twin Towers and 7 World Trade Center were the result of a controlled demolition rather than structural failure due to impact and fire.

#4 Pearl Harbor Conspiracy

The Pearl Harbor conspiracy theory states that US President Franklin Delano Roosevelt had foreknowledge of the attack on Pearl Harbor and deliberately allowed the Hawaiian base to be attacked as a way to convince the American public into supporting the US joining World War II.

#5 HIV/AIDS Conspiracy

Various alternative theories have arisen speculating about the hidden origins of the human immunodeficiency virus (HIV) and the acquired immunodeficiency syndrome (AIDS), ranging from suggestions that they were the inadvertent result of experiments in the development of vaccines to claims that they were intentionally developed by scientists working for the U.S. government.

Some believe the World Health Organization created the virus in a laboratory as a means to control world population.

#6 New World Order

The term New World Order or NWO refers to the emergence of a totalitarian world government. This is a supposed secret society of influential people all over the world who some believe are set on drastically reducing the world’s population in order to have unified control over it.

Numerous historical and current events are seen as steps in an ongoing plot to achieve world domination through secret political gatherings and decision-making processes.

#7 Moon Landing Conspiracy

When man walked on the moon for the first time in 1969, many refused to believe it and instead insist it was hoax staged by NASA and US goverment in order to win the Cold War.

Conspiracists have managed to sustain public interest in their theories for more than 40 years, despite the rebuttals and third-party evidence. Opinion polls taken in various locations have shown that between 6% and 20% of Americans and 28% of Russians surveyed believe that the manned landings were faked.

#8 FEMA’s Plastic Coffins

The discovery of over half a million black plastic coffins outside of Atlanta, GA led some to believe the government is preparing for martial law and the deaths of thousands.

Conspiracy theorists said president Obama has been operating behind the scenes to prepare an action in case of an American revolt that will not only squash a revolution, but kill many of its participants. The first step of this action would be to disarm the American people, and throw anyone that is, or might be, a threat into a detention center — a FEMA camp. During the course of the revolt, many will die, both in battle and in the camps — an inevitable circumstance Obama is already preparing for.

#9 Death of Diana, Princess of Wales

Since 1997 it has been claimed that there was an orchestrated criminal conspiracy to end the life of Diana, Princess of Wales. Many believe she was murdered in an elaborate scheme by the British royal family. They believe her ex-in-laws were embarrassed by the Diana’s new relationship with Dodi Fayed and wanted to avoid further scandal by simply taking her out of the picture.

What do you think about this theories?