Dialectics, especially Engels’s dialectics of nature, is nowadays mostly held in low esteem, even by Marxist scholars because of its Stalinist dogmatisation over the past century. The aim of this comparative review is to show some stakes and prospects, in Marxism and for Marxism, of the debate: the two reviewed books show how the dialectics of nature could, and why it should be considered in a renewed materialist approach to the natural sciences, and provides the reader with complementary outline from (...) the cognitive sciences to physics, via mathematics. (shrink)