While things like the Slinky and the Post-it Note may seem pretty ubiquitous, simple ideas today, they each have their own bizarre accidental origin story. In the second part of this week's two-part series, Ben, Noel and Max dive into the stories of military coil research and a tenacious 3M employee nicknamed "Mr. Persistent."

CLASSIC: Marie Antoinette and the Diamond Necklace Hoax
44:54

Berserkers: Violent Viking Villains, Unverified
31:23

Did Knights Really Wear Suits of Armor?
37:38