“The Shot Heard ‘Round the World”, those familiar with Ralph Waldo Emerson’s 1837 poem Concord Hymn instantly associates the phrase with the American Revolution; however, I suggest they could also associate the phrase with Jonas Salk’s 1938 development of the Flu vaccine, or “shot”. Why is the flu shot so important that it could be mentioned in the same breath as the American Revolution? Well, twenty years prior to Salk’s...