"Happy accident" redirects here. For other uses, see Happy Accidents. Alexander Fleming's discovery of penicillin is an oft-cited example of serendipity.[1] Serendipity is an unplanned fortunate discovery.[2] Serendipity is a common occurrence throughout the history of product invention and scientific discovery.[3] Etymology[edit] The first noted use of "serendipity" was by Horace Walpole on 28 Ja
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