Which of these popular consumer products was accidentally discovered when a researcher forgot to wash his hands after working in a laboratory?

Throughout history, some of the most successful consumer products were discovered entirely by accident! From laboratory mishaps to cooking mistakes, these serendipitous discoveries revolutionized industries and became household names. Test your knowledge about these famous 'happy accidents' that transformed from unexpected findings into billion-dollar product launches.

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Artificial sweetener (Saccharin)
Super Glue (Cyanoacrylate adhesive)
Play-Doh (originally wallpaper cleaner)
Post-it Notes (failed super-strong adhesive)