Which of these popular consumer products was famously discovered by accident when a researcher failed at their original goal?

Some of the world's most beloved consumer products weren't actually invented on purpose! Behind many everyday items we take for granted lies a fascinating story of serendipity, mistakes, and unexpected breakthroughs. This trivia question explores one such famous accidental discovery that revolutionized how we consume a particular product and created an entirely new market category. Can you identify which invention came about completely by accident?

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Post-it Notes - Spencer Silver was trying to develop a super-strong adhesive but instead created one that stuck lightly and could be repositioned
The Slinky - Richard James was designing tension springs for ship instruments when he knocked one off his desk and watched it 'walk' down instead of fall
Bubble Wrap - Alfred Fielding and Marc Chavannes were attempting to create textured wallpaper when they sealed two shower curtains together
WD-40 - Norm Larsen was trying to create a rust-prevention solvent for the aerospace industry when he discovered its multiple household uses