In 1971, which household item did Nike co-founder Bill Bowerman use to create the first prototype of Nike's revolutionary waffle sole design?

Nike is one of the world's most recognizable sports brands today, but its humble beginnings started with a handshake and a waffle iron. Before becoming a global powerhouse, Nike's founders were experimenting with innovative ways to give athletes better traction on various surfaces. This trivia question explores the breakthrough moment that helped launch what would become a revolutionary sports retail empire. Test your knowledge of retail innovation history in the sporting goods industry!

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His wife's waffle iron
A modified toaster
A car tire mold
A modified pasta maker