A massive installation to hunt the slightest and elusive particle: the neutrino. During the last 15 years, the German town of Eggenstein-Leopoldshafen, at the foot of the Rhine, has been preparing to host and see operate a 24-meter-high mastodon designed to measure the mass of this particle that nobody has been able to see. Named as KATRIN (Karlsruhe Tritium Neutrino), it is now started up by 150 basic researchers, engineers and students.

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