Which of these scientific products or experiments was initially considered a failure but ultimately led to a revolutionary discovery?

Product development in scientific research often follows unexpected paths. Some of the most groundbreaking scientific discoveries came from what appeared to be failures or mistakes in the lab. This poll tests your knowledge of famous 'failed' experiments or products that ultimately led to revolutionary scientific breakthroughs. Can you identify which unexpected laboratory accident resulted in a major discovery that transformed its field?

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Alexander Fleming's contaminated Staphylococcus cultures that led to the discovery of penicillin
Marie Curie's intentional radiation of uranium compounds to discover radioactivity
Louis Pasteur's carefully controlled milk heating experiments that created pasteurization
Watson and Crick's methodical DNA modeling approach that revealed the double helix structure