Fixing the glitches that shut down the Large Hadron Collider (LHC) in ...

The eagerly awaited start-up of the Large Hadron Collider (LHC), the world's largest particle accelerator, has been put off--again. The LHC was shut down in September, just days after being switched on for the first time, when an electrical malfunction caused a helium leak in the collider's tunnel. The repairs, which had been expected to last until spring, will now keep the LHC off-line into early summer, according to published statements from a spokesman for the accelerator's operator.