Which NASA-developed retail product has generated the most revenue in commercial sales since its introduction to the consumer market?

Space exploration has always captivated the public imagination, but NASA's retail products have their own fascinating history. Beyond the scientific achievements, NASA has developed a remarkable retail presence with products that bring the cosmos down to Earth. This trivia question explores the product development and customer experience side of astronomy, focusing on NASA's retail success story. Test your knowledge about the intersection of space science and consumer products!

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Memory Foam (originally developed for spacecraft cushioning)
Space Pen (writes in zero gravity, extreme temperatures, and underwater)
Freeze-Dried Ice Cream (created for Apollo missions)
Mylar Space Blankets (developed for satellite insulation)