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Protons launched at nearly 300,000 km per second in long pipes buried underground? The strange machine that achieves this feat reaches 27 kilometers in circumference and crosses the French-Swiss border from one side to the other. It should soon allow us to learn more about the matter that makes up our Universe. Fred and Jamy have set off to discover the largest particle collider in the world. Between protons, neutrons, quarks and gluons... they dive into the universe of the infinitely small and reveal to us the secrets of all these tiny grains of matter that make us up.