The second volume of Martin Heidegger's "Vortrage" (Gesamtausgabe Vol. 80.2) presents ten of his lectures held between 1935 and 1967 (including earlier elaborations) that have never been published before, as well as four texts that have hitherto only appeared outside the Gesamtausgabe. All of the lectures in this volume are now explicitly or implicitly within the horizon of event thinking, which was first fundamentally outlined in the "Beitrage zur Philosophie (Vom Ereignis)" (1936-1938). The question of art, poetry and language is a thematic focus of the volume. A further focus is the question of the nature of modern science and technology and their unification, which Heidegger, in reference to Norbert Wiener, calls "cybernetics". Modern biochemistry and genetics are also included in Heidegger's reflection.