HowStuffWorks_Conspiracy_Theories

When impoverished inventor Nikola Tesla died in New York City, the U.S. government confiscated his notes. Why? Were they trying to steal his technology? Did they ever relinquish the notes?

Donald Trump, like his rival Hillary Clinton, has been the subject of numerous conspiracy theories. But why? Tune in for a look at the allegations surrounding his campaign for president. Stay tuned for next week’s episode on the Clinton campaign.

What was the purpose of Stonehenge? Why would ancient humans take so much effort to build this complex arrangement of massive stones?

From Greek fire to Roman concrete modern humans are only now beginning to rediscover the secret technology of the ancient world.

The Trans-Pacific Partnership is set to be one of the biggest trade agreements in recent US history. So why are so many people furious about it?

In this episode, Ben and Matt travel to DC for a closer look at the famous House of the Temple. Tune in to learn more about the odd history of this iconic temple.

Cultures across the planet have legends describing giant, human-like creatures. Usually, these stories are dismissed as folklore -- yet some people believe a race of giants did exist at some point in Earth's past. Tune in and learn more.

You've heard the phrase before, but what does it really mean? Join Matt and Ben to learn more.

You've heard of MKULTRA in the US, Soviet psychotronics and so on, but the USSR had another program that might surprise you: For several years they searched Mongolia, Tibet and Eurasia for the fabled city of Shambhala. Learn what they found.

In the 1960s, UN Security Chief Dag Hammarskjöld died in a plane crash over modern-day Zambia. For decades the files on the crash were classified or suppressed -- and now, it seems, the truth is finally coming to light.

From 1979 to 1986, an unknown serial killer assaulted and murdered at least 10 people. He remains uncaught to this day. So who was he? Is it possible to find the Original Night Stalker?

Imagine if a government disguised its operatives as members of some other organization -- and then attacked itself. While this might sound crazy, several historians have argued that false flag attacks are more than just conspiracy theories.

What do Ouija boards actually do? Have some games really predicted the future? Tune in to learn more about conspiracy theories in the world of gaming.

What exactly lurks in catacombs? Where are the world's largest? Join Ben and Matt as they dive into the murky world beneath our feet.

60% of Americans believe in psychic powers. What about you?

People around the world eat processed foods -- and it's likely that you've either just eaten (or are about to eat) something containing any number of synthetic flavors, preservatives or other additives. So what's in all this stuff?

The path to the stars isn't all altruism and noble scientific advancement -- in fact, human activities in space have often been shrouded in secrecy, and the practice continues today.

A large part of North America is sitting on a geological time-bomb. Could it explode in your lifetime?

We hear about this mysterious force all the time in fiction and film -- but what is it actually supposed to be? Is there any evidence that it might be real?

In the 21st century, you might assume that we already know most of the intricacies of the human brain... but you'd be wrong. We don't even have all of the basics down yet.

It's true: We do have real lost technology. But what kind of stuff, exactly?

It sounds like something out of the Uncharted series, but it's true: the Nazi party poured millions into a quest to discover lost civilizations. Tune in to learn more.

In the early hours of February 25th, 1942, air raid sirens resounded across Los Angeles, California. The military fired roughly 1500 anti-aircraft machine gun rounds and artillery shells at some unknown object in the sky. So what really happened?

In ancient days civilizations across the world believed Earth was some sort of plane, a flat space in the absolute center of the universe. In recent weeks some celebrities have revived the concept. Is this a genuine belief or a marketing ploy?

In 1977, astronomer Jerry Ehman may have stumbled across the most significant discovery in human history - or, at least, found one of the strangest observable things any human being has ever witnessed. Listen in to learn more about the WOW! signal.