If all goes well, the Hadron‐Electron Ring Accelerator that makes its circular way for 6.3 kilometers under the streets and parks of Hamburg will be ready to do physics within the next two or three months. HERA is a unique high‐energy storage‐ring collider. All the other high‐energy colliders, built or pending, make particles collide with others of the same species, or their antiparticles. And the particle energies in the two colliding beams are generally the same.

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