Lead ion collision at the Large Hadron Collider. This is the world's highest-energy particle accelerator. Up until now, they were colliding protons. Using lead ions, they created temperatures a million times hotter than at the centre of the Sun.
The Higgs boson is perhaps better known by its nickname: the "God particle." Discovery of God Particle is a major breakthrough in the field of nuclea. The God Particle, I hate that name, using this is giving those religious crazies a nod.