Ten lucky discoveries!

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I saw the article while surfing through the net here: http://www.socyberty.com/History/Oops-Lucky-Me-10-Accidental-Product-Discoveries.150607 I'm not sure how many of them are true - I know the Xray, microwave, penicillin stories are true. I've heard a different version of potato chips being discovered accidentally - something about potato slices accidentally soaking in salt water and then being fried. Did you know these accidental discoveries?