The investigation of high energy cosmic rays and their interactions is a very
active field of research. This article summarizes the progress made during the
last years as reflected by the contributions to the XIII International
Symposium on Very High Energy Cosmic Ray Interactions held in Pylos, Greece.Comment: Summary talk given at XIII ISVHECRI, Pylos (Greece), Sept. 2004; 22
pages, 8 figures, to appear in Nucl. Phys. B (Proc. Suppl.