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Betty James who came up with the name for her husband's famous offspring always knew the secret which she shared in a 2001 interview. "Children love simple things," she said. They’re not the only ones.

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Richard started his own department store demo that sparked a craze, but 72 years later more than 300 million have been sold

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Shopkeepers thought it was to boring for kids that are used to loud and colorful toys

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For the next few years he tinkered with coils searching for the slinkiest shape, one that is fully compressed when relaxed.

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Richard was working with torsion springs when one of them fell out of the box he watched it in amazement as it walked acrosst the table

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Richard James was a naval engineer during world war II

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The slinky was made on an accident by Richard James