When physicists are forced to give a single-word answer to the question of why we are building the Large Had-ron Collider (LHC), we usually reply "Higgs." The Higgs particle-the last remaining undiscovered piece of our current theory of matter-is the marquee attraction. But the full story is much more interesting. The new collider provides the greatest leap in capability of any instrument in the history of particle physics. We do not know what it will find, but the discoveries we make and the new puzzles we encounter are certain to change the face of particle physics and to echo through neighboring sciences.
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