High energy cosmic rays

I review here some of the physics we are learning and expect to learn in the near future through the observation of cosmic rays. The study of cosmic rays involves a combination of data from accelerators, ground arrays, atmospheric fluorescence detectors and balloon and satellite experiments. I will discuss the data of the Pierre Auger Observatory, PAMELA, ATIC and FST among other experiments.Comment: 18 pages, 18 figures (iopams.sty, jpconf11.clo and jpconf.cls required to tex). Plenary talk at "Discrete `08", December 11-16 2008, Valencia, Spai