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The eTwinning project on cosmic rays introduces students to the study of these fundamental particles, exploring their origin, characteristics, and scientific significance. Through a structured educational journey, students will delve into:What cosmic rays are and their purpose. Which particles compose them. The scientists who discovered them. A key feature of the project is the use of the MOCRIL particle detector, allowing real-time measurements. As the teacher responsible for the project, I will personally handle the measurements in my laboratory, sharing the data with students and proposing exercises and laboratory activities. Students will not only acquire theoretical knowledge but also actively participate in data analysis, learning how to interpret astrophysical phenomena and use advanced scientific instruments. This innovative experimental approach has received national and international recognition, including the prestigious Atlante Award, the first prize in Beijing, inclusion on the ESERO platform by the European Space Agency, and the selection of our cover image for the International Cosmic Day 2024 booklet. The experimental setup, developed by Prof. Marco Schioppa (UNICAL-INFN Calabria, Italy), is designed to study cosmic muons, contributing to the understanding of cosmic rays and related phenomena. Understanding particles means expanding knowledge in medical physics as well. Today, particles are used as a tool for investigation and therapy in medicine. In addition to PET (Positron Emission Tomography) and hadrontherapy (therapy with proton or ion beams), particles are also fundamental in:Conventional radiotherapy: beams of electrons and photons (X-rays and gamma rays) are used to destroy tumor cells. Diagnostic imaging: in addition to PET, which detects the annihilation of positrons emitted by radiopharmaceuticals, SPECT (Single Photon Emission Computed Tomography) also uses radioactive tracers that emit photons to obtain functional images of organs. Research and development of new drugs: radioactive isotope tracing techniques allow studying the path and metabolism of drugs within the body. Exploring cosmic rays means unlocking the secrets of the universe and inspiring future generations of scientists. Prof. Giuseppe Fiamingo IIS P. Galluppi, Tropea – Italy