Higgs boson: 'We have it'
4 July 2012 Last updated at 11:48 BST
Scientists at the Large Hadron Collider claim the discovery of a particle believed to be the long-sought Higgs boson.
Rolf Heuer, director-general of Cern, said "As a layman I would now say I think we have it."
Peter Higgs, after whom the particle is named, said it was incredible that this has happened in his lifetime.