Which famous consumer product was accidentally discovered when a researcher failed to wash his hands after a laboratory experiment, and later noticed a lingering sweet taste?

Throughout history, many of our most beloved consumer products weren't initially designed for their eventual use. These 'happy accidents' revolutionized industries and became household staples. Test your knowledge about these serendipitous discoveries that transformed from laboratory mishaps into billion-dollar product lines. Can you identify which unexpected product discovery changed consumer behavior forever?

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Artificial sweetener saccharin, which became Sweet'N Low
The artificial sweetener aspartame, which became NutraSweet
The flavor enhancer monosodium glutamate (MSG)
Xylitol, the sugar substitute commonly used in chewing gum