The discovery of a new particle thought to be the elusive Higgs boson represents the culmination of nearly 50 years of research, and completes a theory about how the most basic constituents of matter interact with each other.
Even if the newly discovered 'God particle' is not the Higgs boson as it was originally conceived, the implications of the new finding for science are still significant. The discovery is likely to provide the whole field of particle physics with a burst of momentum.
Physicists at the European Organization for Nuclear Research, or CERN, say that they have very strong evidence for the existence of the Higgs boson, a particle that, if it exists, would help explain why matter has mass.
Video of a similar incident at University of California, Davis, in November drew worldwide attention. In that footage, an officer doused a row of student protesters with pepper spray as they sat passively.