In which a bygone errand, developing vacation snapshots, becomes so widespread that it gets its own chain of drive-thru kiosks, and Ken's mom looks great in a red knit jumper and gold polyester turtleneck. Certificate #38597.
In which four mysterious cones are unearthed from proto-Celtic Europe, perhaps holding untold secrets of the calendar and cosmos, and John is surrounded by the happy nudists of the Danube. Certificate #23490
In which a periodic "atmospheric river" from the Pacific Ocean threatens to put a quarter of Californians underwater in the very near future, which scares Ken so much that he decides to drill holes in his couch. Certificate #23973.
In which doomed Arctic explorers and a spiritualist's vacuum sealer help revolutionize the science of food storage, and John reveals that his "dueling scars" are actually from drinking cold canned pasta. Certificate #42072.
In which over a century of mathematicians are unable to solve a geometry problem straight out of a coloring book, computers provide their first ever math "proof," and Ken challenges John to map a donut. Certificate #28876.