Article: Strange case of the unbreakable proton

The leafy outer suburbs of Hamburg, Germany, are home to one of the world's largest electron "microscopes". The device, known as Hera, is actually a large subatomic racetrack around which researchers fire elementary particles in order to probe the fundamental constituents of the material universe.

Over the past 50 years, researchers have collected an increasingly exotic menagerie of subnuclear particles, whose sometimes whimsical names reflect their esoteric nature: pions, muons, quarks, and the gluons that bind (or "glue") the quarks together. But there is now a lot of excitement at Hera, where they believe they have detected a particle so exotic that even the physicists d not think it can ...

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