The Slinky. Possibly one of America's greatest toy inventions was accidentally created by Richard T. James. James, a mechanical engineer, gave birth to the Slinky one day while at work. James worked with naval vessels and was handling some tension springs when suddenly he dropped one. After observing the spring bounce around on the ground, an idea was formed. James tweaked the Slinky spring and had them mass produced. Since the toy was created, nearly 300 million Slinkys have been purchased. That is a lot of $$$!
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