We all know pi, right? It's one of the most famous 'irrational numbers' in history, and mathematicians are still trying to figure it out in the modern day. While this may seem arcane to some of us non-mathheads, in today's episode, Ben, Noel and Max learn these numbers were3 once such a big deal that legends say folks got murdered for discovering them. Tune in to learn the harrowing tale of Hippasus, a Pythagorean cultist who discovered irrational numbers -- and, in doing so, pissed off the Gods so much that they drowned him.

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As the Fox sisters became global superstars for their purported ability to speak with the dead, the Spiritualism movement became both a social phenomena and a booming business. Yet along with the rise of true believers and performing psychics, an army of skeptics and investigators rose as well... and the questions they asked eventually brought the entirety of the movement down. Join Ben, Noel, Max and returning special guest Jonathan Strickland (aka The Quizster) for the second part of this special two-part episode.

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Language is beautiful and, in many cases, continually evolving. As a result, we end up with hundreds of strange idioms and figures of speech that we use on a daily basis, with little to no understanding of what they originally meant. Join the guys with special guests Frank Mulherin and Rowan Newbie, the creator of the Pitches podcast, as they explore the bizarre origins of your favorite turns of phrase in this week's Classic episode.

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It's a pickle for the ages: What happens when you die? The Spiritualism movement may seem obscure today -- but back in the mid-19th century, this religious and social phenomenon absolutely rocked the modern world. In the first part of this special two-part episode, Ben, Noel and Max welcome back Jonathan Strickland (aka the Quizster) to explore the rise of this movement... and Jonathan promises to behave.

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Let's be honest: national anthems are cool... but definitely propaganda, and often objectively weird. In today's episode, Ben, Noel and Max explore some of history's strangest national anthems. Some are inspiring, some are plain odd -- and, as the guys learn, a lot of national anthems change over time.

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Today the Statue of Liberty is one of the most famous landmarks in the United States -- but it almost didn't make it to Ellis Island. Join the Ben and Noel as they explore the strange story of Frédéric Auguste Bartholdi and his quest to build this iconic monument in this week's classic episode.

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Did you know over 90% of US households own a vacuum cleaner? These handy-dandy descendents of the carpet sweeper revolutionized the cleaning game... but where did they come from? As Ben, Noel and Max discover in today's episode, your humble vacuum is the result of centuries' worth of wild ideas -- and more than a few crazily ambitious inventors, as well.

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When illustrator and novelist Rose O'Neill first debuted the Kewpie cartoons in 1909, these loveable little characters took the world by storm. Yet O'Neill didn't stop there. In today's episode, Ben, Noel and Max learn the surprisingly inspiring and feminist story of the Kewpie doll as a crucial aspect of women's rights in the United States.

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When Juan Pujol first volunteered to spy for the British during World War II, they didn’t take him seriously. That all changed when he got a gig spying for the German government. Listen to learn the story of one of World War II’s most successful double agents.

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Often called "the thick, creamy bastard child of oil and eggs" (well, called that at least once by Ben), mayonnaise remains one of the world's most divisive condiment. But where did it come from? In today's continuing Ridiculous History of condiments, Ben, Noel and Max get to the bottom of the case. Or jar. You get it!

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