In which an ancient linguistic and religious practice becomes a jaunty, ambulatory musical form before falling into decline, and John does not want to see condors in a hospital. Certificate #45133.

In which centuries of sterilization-happy doomsayers fail to predict a game-changing revolution in wheat, and Ken thinks Pakistan wants John to clean out his fridge. Certificate #2037.

In which dozens of national sleeping guys with long beards wait in caves for their countries to need them again, and John thinks Tom Cruise should not be in a courtyard. Certificate #53610.

In which conservative Sun Belt retirees and progressive urbanists agree on a nostalgic but radical revolution in city design, and Ken does a Normal Rockwell impression. Certificate #34959.

In which a Thracian slave from two thousand years earlier becomes a proletarian role model and Communist sports hero, and John prefers action stars with boogers. Certificate #37084.

In which the long war between alternating and direct current produces power outlets that multiply nto a dizzying world of configurations, and Ken needs a grounding prong. Certificate #29673.

In which Scottish clans each choose a distinctive plaid based on a romantic Highland history that didn't really happen, and John takes a hard hit while playing Frisbee in a skirt. Certificate #26624.

In which a constitutional change finally happens after a two-hundred-year delay just to spite one Texas poli sci professor, and Ken likes it when scriveners get away scot-free. Certificate #43079.

In which the toy market is revolutionized by a faddish stuffed animal that would be priceless today if it hadn't disappeared, and John buys the concept of a rabbit. Certificate #24398.

In which the great Mediterranean civilizations of the late Bronze Age collapse virtually overnight due to some mysterious visitors, and Ken knows a lot about white broccoli. Certificate #9795.

In which Melanesian eco-revolutionaries fight off helicopter gunships with literal slingshots and homemade diesel, and John makes a shocking announcement about all scientists. Certificate #54146.

In which a curd-heavy side from central Quebec belatedly becomes the national dish of a land with no real national cuisine, and Ken learns so much about Sacramento culture. Certificate #30037.

In which a secret society of plucky Civil War veterans hatches a plan to return Ireland to the Irish by—wait for it—invading Canada, and John doesn't think the people who sold him wine coolers actually exist. Certificate #12129.

In which even the most hated typeface in the history of desktop publishing has its defenders, and Ken isn't sure why he owns cargo shorts. Certificate #54861.

In which a flirty but forgotten Tin Pan Alley song leads to the first great moral panic in pop music history, and John sneakily borrows someone else's shanty town. Certificate #12960.

In which a state politician's lack of badminton equipment leads to the invention of the hottest sport of the 21st century, and Ken is slightly present. Certificate #42131.

In which researchers squabble for centuries about the secret ingredient that made one Cremonese craftsman the greatest musical instrument-maker of all time, and John seasons guitars under a bus. Certificate #36611.

In which a king agrees to hand over his seventh-best island in the hopes of creating a haven for his native Hawaiian language and culture, and Ken does not want to greet Zach. Certificate #43273.

In which the last universal physicist demonstrates to his students that ballpark estimates in math can be as powerful as precision, and John isn't sure if Romanians can count tomatoes. Certificate #46480.

In which an ill-advised utopian scheme to bypass Niagara Falls becomes America's first toxic waste catastrophe, and Ken knows the main thing that water does. Certificate #42025.

In which the great gourmet food of 19th-century "frolics" suddenly disappears from American menus, and John thinks humankind often looks to weasels. Certificate #32793.

In which the tragic death of a gorilla at the Cincinnati Zoo launches a tidal wave of viral content on social media, and Ken explains bad table manners as an accident of birth. Certificate #23616.

In which the most notorious convict in America attempts no fewer than four separate escapes from the Alcatraz of the Cumberland Mountains, and John would never disparage the banjo. Certificate #1746.

In which a mysterious outbreak of "glass pox," possibly a result of nuclear testing, hits the Pacific Northwest, and Ken doesn't think Sherlock Holmes knows any teenagers. Certificate #40197.