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With instruments offering “ tantalizing hints ” in support of the Higgs boson, the elementary particle thought to endow matter with mass, we stand at a singular moment in time for physics.

"The orbiter is a completely different vehicle than anything that has ever flown in space." It was a work platform, a spacewalk platform, a construction site with a robotic arm, a laboratory, a people mover. It was a complex vehicle operating at the edge of its performance, with very little margin for error," John Shannon, program manager at the Johnson Space Center in Houston told Air & Space magazine in March.