“…(2000). The issue has since been explored in more detail in a symposium organized by Léna Soler, published in History and Philosophy of Science (Franklin, 2008;Sankey, 2008;Soler, 2008aSoler, , 2008bTrizio, 2008), in a focus section of Isis dedicated to the role of counterfactuals in the history of science (Bowler, 2008;French, 2008;Fuller, 2008;Henry, 2008;Radick, 2008) and at a conference titled Science as it Could Have Been, held in 2009. 2 We can find some further explicit references to the contingency issue (Kidd, 2013, in press;Martin, 2013;Radick, 2003Radick, , 2005 but in general, systematic and conceptually rigorous literature on the problem is rare.…”