Which of these scientific innovations was accidentally discovered when a researcher was working on a completely unrelated project?

Throughout history, many scientific discoveries have transformed into revolutionary commercial products that changed our daily lives. Some of these breakthroughs happened by accident, while others were the result of decades of research. This poll tests your knowledge about the fascinating intersection of scientific discovery and product development. Do you know which famous scientific innovation became a household name?

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Penicillin, discovered when Alexander Fleming noticed mold killing bacteria on an accidentally contaminated petri dish
Insulin, discovered by Frederick Banting and Charles Best through systematic experiments designed specifically to isolate the hormone
The polio vaccine, developed by Jonas Salk through years of targeted viral research and carefully designed clinical trials
DNA structure, determined by Watson and Crick after dedicated research into X-ray crystallography data specifically to understand genetic material