In which an ancient Mesopotamian board game briefly becomes a 1970s signifier for glamour and sophistication, and Ken's life is changed by an intense childhood game of Clue. Certificate #31179.

In which an outsider artist hides a rabbit by a statue and thereby gets a million people to start digging up the English countryside, and John "man-solves" a Satanic temple. Certificate #14162.

In which a room full of MIT train nerds becomes ground zero for modern American hacker culture and computer architecture, and Ken blames Star Wars for ruining children's toys. Certificate #33564.

In which the Byzantine throne is contested by various Machiavellian schemes willing to mutilate the noses of their political rivals, and John reveals which Marx brother he is most sexually attracted to. Certificate #34954.

In which a World War I army camp in northern Kentucky is chosen to house over $200 billion in gold bullion, and Ken proposes nationalizing America's safety deposit boxes. Certificate #2504.

In which we learn why new highway lanes, no matter how spacious, tend to fill to capacity within weeks of opening, and John takes on a hypothetical megacorporation called Goober. Certificate #38938.

In which ecologically problematic outdoor power tools accidentally become an official part of the Omnibus, all because John's neighbor refuses to call "Leafbusters." Certificate #25458.

In which a Spokane antique store creates a fake Bavarian holiday tradition from scratch, and John's beard makes him look bigger. Certificate #31503.

In which we examine the broadcast-jamming fad of the 1980s, including a puzzling incident involving a masked Chicago prankster, and Ken wants to be a font cop. Certificate #29692.

In which a strange, sticky new protein is declared—on the basis of very little evidence—to be a cure-all in the war against cancer, and Ken refuses to make the necessary sacrifices to become a skateboarding star. Certificate #40478.

In which a 19th-century countess overcomes her father's scandalous celebrity and her mother's love of parallelograms to become the world's first computer programmer, and John comes to regret renaming Alexa. Certificate #46507.

In which we learn that America's love affair with do-si-dos is a relatively recent and artificial form of nostalgia jump-started by Henry Ford's hatred for jazz, and Ken misremembers "krumping." Certificate #42537.

In which an oddly named model of Toyota pickup becomes the truck of choice for Marty McFly, Top Gear fans, polar explorers, and ISIS. Certificate #16197.

In which one of Queen Victoria's ladies-in-waiting atones for her gossip scandals at court by inventing a brand new meal, and John blames museum docents for all his schedule problems. Certificate #48479.

In which an Irish immigrant pretending to be an old lady becomes a star of the American labor movement, and Ken ponders the death of middle initials. Certificate #12952.

In which Ken blames the weirdest ballet premiere of all time on class warfare, bad hair and costuming choices, and anti-Russian xenophobia, and John renames the sport of gymnastics. Certificate #31616.

In which one canny Detroit billionaire manages to gain sole control of the linchpin of American foreign trade, and John repeatedly insists he is not giving advice to terrorists. Certificate #36634.

In which lawns are revealed to be covering three times as much of America as any other crop, and Ken explains why the tallgrass prairies of the 19th century produced no great tennis players. Certificate #31632.

In which Victorian England becomes obsessed with the beautiful fronds and sexy lifestyle of ferns, and John brings the Arts and Crafts movement to the grunge era. Certificate #31358.

In which a Dominican diplomat cozies up to one of history's worst dictators, marries the two richest women in the world, and creates our modern image of the macho "Latin lover," and Ken tries to revive some slang from 1980s sex comedies. Certificate #41003.

In which Ronald Reagan, of all people, introduces a new legal philosophy of marriage and divorce to America in 1970, though it takes New York forty years to catch up. Certificate #27256.

In which a single 1961 comic book births a multiverse and reshapes our modern understanding of parallel dimensions in art as well as life, and John wistfully fantasizes about an honest Hitler. Certificate #46819.

In which the "mondo" shock movie craze of the 1960s inspires a morbid megahit that turns out to be more hoax than documentary, and monkey brains make their big-screen debut. Certificate #41907.

In which the origins of America's favorite 21st-century horror trope are traced back to the miseries of Caribbean plantation slavery, which is a huge bummer, and John ponders the role of squash in the afterlife. Certificate #49964.

In which an American dairy surplus and some dubious policy decisions creates a processed welfare staple of the Reagan era, and Ken reveals his favorite lunchmeat. Certificate #24553.