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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