Formed in 1921, the Council on Foreign Relations is one of the most influential organizations in the United States -- but who are they? Strap on your tinfoil hat and take a look at the conspiracy theories surrounding the CFR and one-world government.

As World War II raged across Europe and the Pacific, the conflict reached every continent on the planet, including Antarctica. Learn more about the little-known Nazi expeditions to Antarctica -- and what they hoped to find there -- in this episode.

Experts agree that jet contrails are harmless, yet thousands of people think the vapors are evidence for anything from massive drug dosing to weather wars. Why? Learn more about the conspiracy theories surrounding chemtrails in this episode.

Thousands of people across the globe believe the world will end in 2012 -- but why? Tune in and learn more about the beliefs of 2012ers, from interpretations of the ancient Mayan calendar to concerns over irregular sunspot cycles and solar storms.

Communities across the US add fluoride to the water supply. Mainstream experts believe it prevents tooth decay, but conspiracy theorists think there's something sinister afoot. Tune in to learn the craziest fluoride conspiracies in this episode.

Between 1799 to 1892, families across New England dug up the corpses of their children, parents and siblings, desecrating the bodies in an effort to prevent them from rising from the grave. Learn more Stuff They Don't Want You To Know in this episode.

Serial killers typically work alone. However, some serial killers have claimed to be part of a nationwide cult -- and some people believe them. Why? After all, this theory relies on the statements of the criminally insane. Learn more in this episode.

Although sightings of the Chupacabra were first reported in Puerto Rico, eyewitness reports soon began to arrive from across the Americas. But what exactly is this thing? Is it even real? Learn the craziest Chupacabra conspiracy theories in this episode.

With Pluto's recent demotion from the ranks of proper planets, the slippery definition of what is or is not a planet has revived several astronomical conspiracy theories. Learn about the most bizarre conspiracies surrounding Planet X in this episode.

Conspiracy theorists across the world believe that freemasons control the District of Columbia through the use of arcane symbols and geomancy. But why? Tune in and learn about the strange beliefs driving this conspiracy theory.

Thousands of people across the planet believe that the world is flat. Why? Their 'evidence,' while not convincing, is certainly bizarre. Tune in and learn more about one of the craziest conspiracy theories on Earth in this episode.