In which butter substitutes have to overcome scientific hurdles, dairy-friendly laws, and bad news about trans fats, and Ken thinks Germany is trying to control olive oil. Certificate #34384.

In which Poland's most famous exile partially returns to Warsaw to posthumously annoy both tsars and Nazis, and John's restaurant idea has some light cannibalism. Certificate #31277.

In which today's cities face tough choices on how to guide urban behavior with incredibly uncomfortable-looking design features, and Ken would pee on a fly but not a bee. Certificate #19421.

In which it takes decades for America to decide whether its civil war was an insurrection or an invasion, nomenclature-wise, and John walks very erratically on his orange shag carpet. Certificate #26478.

In which six bored, Cambridge-connected bohemians con their way onto the British Empire's naval flagship by dressing as African royalty, and Ken thinks John is either Batman or a Karen. Certificate #19722.

In which a crusading social psychiatrist drums up the moral panic that gets two mega-popular comic book genres banned from America's newsstands, and John agrees that punching Hitler is unmissable. Certificate #44894.

In which it takes Europe over two thousand years to figure out that the greatest of the great apes is not just Carthaginian folklore, and Ken would like to be considered merciful. Certificate #46468.

In which the popularity of "mourning bequeathments" and the death of the Prince Consort lead to an explosion of morbid family handicrafts, and John gives away the same piano twice. Certificate #50902.

In which a Honolulu teenager discovers a rusty bolt by the side of the road and changes the face of 20th-century music across multiple genres, and Ken is surprised to learn what Aerosmith, Paul Shaffer, and Harvard have in common. Certificate #35281.

In which a famed monastic tradition is revealed to be a modern misunderstanding of the chattiness of religious life, and Ken does not want to know what a Robot Guitar really is. Certificate #38497.