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In a previous version of this book review, Ignaz Semmelweis' first name was misspelled as Ignatz.
In September 2011, astronomer Donald Olson, after a visit to the Lake Geneva villa the previous year, and inspecting data about the motion of the moon and stars, concluded that her "waking dream" took place "between 2 . and 3 ." on 16 June 1816, several days after the initial idea by Lord Byron that they each write a ghost story.