For almost two decades, Peter Turchin has been involved, with many colleagues and co-authors, in an epochal project: to figure out, using quantifiable evidence, what are the forces that lead to the rise, and more importantly, to the decline of nations, political turbulence and decay, and revolutions. This has resulted in the creation of an enormous database (CrisisDB) covering multitude of nations and empires over centuries, and several volumes of Turchin’s writings (e.g., Secular Cycles (with Sergey Nefedov), War and Peace and War; I have read the former, not the latter).