J.M.S. PearceUnited Kingdom But society has now fairly got the better of individuality; and the danger which threatens human nature, is not the excess, but the deficiency, of personal impulses and preferences.John Stuart Mill (1806–1873), On Liberty, chapter 3, 1859 John Snow’s classical publication, On the Mode of Communication of Cholera, 1849, exemplified the undoubted benefits…