Which innovative cushioning technology, first introduced by Nike in 1978 and still used today, was initially developed by aerospace engineer Frank Rudy who approached Nike with his invention?

The sports apparel industry has seen numerous innovations in product development over the decades, particularly in athletic footwear. These innovations have dramatically changed athlete performance and consumer expectations. This trivia question focuses on a pivotal moment in Nike's product development history that revolutionized the athletic shoe market and established one of their most successful product lines.

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Air cushioning (Nike Air technology)
React foam cushioning
Zoom Air technology
Shox cushioning columns