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Did you ever have a Slinky?

“Richard James invented the Slinky by accident. He was trying to develop a spring that could help keep sensitive ship-board instruments steady at sea. He knocked some of these experimental springs off a shelf, and was amused by the way they “walked” down, rather than just falling.”

A Slinky is a coil-shaped toy, invented by naval engineer Richard James and his wife, Betty James. Slinkys come in various sizes, but are usually no larger than a grown adult’s fist when compressed.  The Slinky is famous for its ability to “walk” down stairs as the coils stretch and reform as gravity moves them down each step.