Which scientific product was initially rejected by its developer's own company, who claimed it had 'no commercial applications', before becoming a billion-dollar innovation?

Behind many revolutionary scientific products and discoveries lies a fascinating story of corporate resilience and unexpected pivots. Some of today's most impactful scientific innovations nearly failed before changing our world forever. This trivia tests your knowledge of product development challenges in the scientific realm and how persistence led to breakthrough success.

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Post-it Notes (3M's accidental adhesive discovery)
Penicillin (Alexander Fleming's mold research)
X-ray imaging technology (Wilhelm Röntgen's discovery)
Teflon coating (DuPont's fluoropolymer accident)