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Historians recently rehabilitated Einstein's "physical strategy" for GeneralRelativity (GR). Independently, particle physicists similarly re-derivedEinstein's equations for a massless spin 2 field. But why not a light\emph{massive} spin 2, like Neumann and Seeliger did to Newton? Massivegravities are bimetric, supporting conventionalism over geometric empiricism.Nonuniqueness lets field equations explain geometry but not \emph{vice versa}.Massive gravity would have blocked Schlick's critique of Kant's synthetic\emph{a priori}. Finally in 1970 massive spin 2 gravity seemed unstable orempirically falsified. GR was vindicated, but later and on better grounds.However, recently dark energy and theoretical progress have made massive spin 2gravity potentially viable again.

Historical and Philosophical Insights about General Relativity and Space-time from Particle Physics