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British theoretical physicist Professor Peter Higgs (b. 1929). In 1964, Higgs predicted the existence of a new type of fundamental particle, commonly called the Higgs boson. This particle is required by many of the current Grand Unified Theories (or GUTs) which hope to explain three of the fundamental forces (electromagnetism, the weak & the strong nuclear forces) in a single unified theory. Higgs is professor of theoretical physics at Edinburgh University. This photograph was taken at his office in Edinburgh in 1988. The discovery of a particle consistent with the Higgs boson was announced by scientists at CERN (the European particle physics laboratory) on the 4th July 2012. Further analysis will be needed to confirm the results. (KEYSTONE/SCIENCE PHOTO LIBRARY/DAVID PARKER/SCIENCE PHOTO LIBRARY)