A naval engineer trying to stabilize equipment during World War II accidentally knocked a spring off a shelf and watched it “walk.” That mistake became the Slinky, one of the most recognizable toys in American history. But the real story goes far beyond the invention itself. In this episode, we explore the physics behind the Slinky’s strange motion, the rise of the toy as a cultural icon, and the remarkable story of Betty James, the woman who rescued the company when it was on the verge of collapse.