The Highest Energy Cosmic Rays*

I refuse to start yet another abstract saying that the origin of cosmic rays is a mystery. Instead, I would like to highlight the progress made by ultra-high energy cosmic ray experiments in the last three years. The Pierre Auger Observatory and the Telescope Array are the largest cosmic ray detectors ever built, and together they cover the entire sky at the highest energies. I will present the most recent experimental results, and discuss their implications toward an understanding of the origin of Extragalactic cosmic rays. Finding the transition between Galactic and Extragalactic origin is an important step forward because it will allow us to concentrate our searches on specific energy ranges and specific objects in the sky.