The number one selling toy at Christmas was the Slinky What was the Slinky originally developed for?

The Slinky was originally developed in the early 1940s by naval engineer Richard T. James as a tool to stabilize sensitive instruments aboard ships. It was designed to be a tension spring that could absorb shock and vibration. However, after it was accidentally dropped and began to "walk" down a series of steps, James recognized its potential as a toy, leading to its iconic status as a children's plaything.