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"Mary Had a Little Lamb" is a 19th century American nursery rhyme. It was written by Sarah Josepha Hale, who turned to writing in 1822 as a widow trying to support her family and who eventually became an influential editor and arbiter of American taste. Thomas Edison recited part of the poem to test his invention of the phonograph, and a host of musicians have recorded versions of it.
The nursery rhyme is said to have been based on an actual incident in which what happened?
Source: Free Dictionary Encylopedia