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1ssDay One: Tuesday, April 21,2009A SLICE THROUGH SPACETIME . . .The control building for CERN's Large Hadron Collider was new: it had been authorized in A.D. 2004 and completed in 2006. The building enclosed a central courtyard, inevitably named "the nucleus." Every office had a window either facing in toward the nucleus or out toward the rest of CERN's sprawling campus. The quadrangle surroimding the nucleus was two stories tall, but the main elevators had four stops: the two above-ground levels; the basement, which housed boiler rooms and storage; and the minus-one-hundred-meter level, which exited onto a staging area for the monorail used to travel along the twenty-seven-kilometer circumference of the collider tunnel. The tunnel itself ran vmder farmers' fields, the outskirts of the Geneva airport, and the foothills of the Jura mountains.The south wall of the control building's main corridor was divided into runeteen long sections, each of which had been decorated with a mosaic made by an artist from one of CERN's member coimtries. The one from Greece depicted Democritus and the origin of atomic theory; the one from Germany por-