Scientists at CERN turned the Large Hadron Collider back on and injected protons into the particle stream on Friday, resuming operations for the first time in a year.
Last year, shortly after it became operational for the first time, the LHC experienced a failure in one of the containment magnets that keeps the particles within their track and going around in circles. Because of the tremendous forces required, these magnets are extremely powerful, and if they become misaligned by even a tiny amount, they can fail catastrophically, destroying themselves.
That's what happened last year, and resulted in repairs and replacement of the magnet. It took a while to complete the repairs because the LHC is kept at a brisk -271°C and had to be warmed up slowly, repaired, and cooled back down slowly, but the work is finally done and science is once again underway at the world's most powerful particle collider.
And, in case you hadn't noticed, it still hasn't destroyed the world.