As the gang gets ever closer to finally completing their mission to do an episode on every state in the United States, they arrive at North Dakota. While North Dakota remains one of the nation's least populated states, it's still chock-full of Ridiculous History. And, as Ben, Noel and Max discover in today's episode, the bizarre tale of Fort Sauerkraut may be one of the strangest ones out there.

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Here's one for the cat lovers: Does your feline friend absolutely love catnip? If you have a cat with the right sensitivities, this stuff completely rocks their world. They'll go nuts for it, rolling around in the stuff, chewing it, drooling in a stupor and so on. In today's episode -- inspired by a listener suggestion -- Ben, Noel and Max dive into the ridiculous story of a get-rich-quick catnip scheme, when a New York peddler down on his luck tried to sell catnip door to door... and caused a full-on cat riot in the process.

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In this week's Classic episode, the guys return to a strange, oft-overlooked aspect of the Civil War. From 1861 to 1865, the United States of America was a country divided. More than a century later, it remains America's bloodiest war. After the cessation of conflicts and the surrender of the Confederate army, General Robert E. Lee found himself constantly approached to endorse numerous different memorials, statues and other structures. There was just one problem -- he apparently hated them.

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Have you ever taken an IQ test? Originally envisioned as a way to determine which French children should be locked in asylums, Alfred Binet's attempt to quantify human intelligence took the modern world by storm. Yet, as Ben, Noel and Max ask in this follow-up to lead exposure: How accurate are the IQ tests? Are they genuinely accurate, or, ironically enough... their own sort of dumb?

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Don't do lead, kids! Nowadays everyone knows the dangers this substance poses to humans -- especially children in their formative years -- but back in the day, lead was everywhere. Ancient Rome was riddled with the stuff, using lead in everything from pipes, to smelting, to cutlery, pottery and wine. It's tough to know just how much lead the average person encountered, but breathing the lead-filled air alone may have dropped children's IQs by up to three points. In today's episode, Ben, Noel and Max discover a fascinating, controversial theory: that Rome didn't fall due to war and economic troubles... but instead, the empire toppled because everyone slowly became dumber and dumber.

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In this week's Classic episode: In 1918, as the planet was consumed by World War I, the government of California found itself combating an unexpected and catastrophic enemy: Ground squirrels. The rodents were wreaking havoc across the countryside, consuming crops left and right. State horticulture commissioner George H. Hecke proposed an unorthodox solution -- enlist schoolchildren in a statewide massacre of all ground squirrels. Oddly enough, it worked.

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Most people think of yo-yos as a fun, old-school toy for kids: a pretty simple, clever device leveraging physics with a string and a weight. Yet as Ben, Noel and Max discover in today's episode, the story of the humble dates back into antiquity -- and the story of its evolution is riddled with ridiculous ups and downs.

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The results are in: pretty much everyone loves pizza... but what doth a pizza make varies from place to place. Obsessed with a game-changing message from a former pizzaiolo on the inside, Ben, Noel and Max dive into the delicious (and arguably disturbing) conspiracy of what makes a pizza "supreme".

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