First detection of extensive air shower with the EEE experiment

The Extreme Energy Events (EEE) project is devoted to search extremely high energy cosmic rays, by means of an array of hodoscopes distributed over the Italian territory. These stations are based on the use of Multigap Resistive Plate Chambers (MRPC), that have excellent time resolution and good tracking capability. They are installed in selected secondary school institutes, where students are involved in the research work. In this article the analysis of the first extensive air shower detected is presented.