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Quantum field theory was first introduced by Paul Dirac when he reworked quantum mechanics to incorporate special relativity (high speeds and mass/energy equivalence). A surprising result came out of Dirac's first version of quantum field theory; the existence of antimatter! At the time, it was difficult to believe, but later experiments proved antimatter is real! PET (Position Emissions Topography) scans at hospitals are based on antimatter detection. Richard Feynman further developed quantum field theory with his incorporation of electromagnetism. His theory, called quantum electrodynamics, describes interactions of elections with photons. In this theory, photons and electrons are not "little billiard balls" but rather viewed as field quanta or ripples or excitations that "look" like particles. Ubiquitous electrons interact with the electromagnetic field through the action of force carrying particles---the photon, our usual ray of light! In modern physics, particles and their interactions can now be viewed in the context of fields, which is the current model used to describe all the forces in nature and all the fundamental particles. This theory paved the way for the Standard Model, which is the most complete quantum field theory we have today with actual experimental evidence which includes quantum electrodynamics (electrons-photons), QCD (quark-gluon), the weak interaction, neutron, or beta decay (radioactivity), and the Higgs field/Higgs boson (gives mass to particles), which was purportedly seen in the summer of 2012! and the Standard Model Dirac QUANTUM FIELD THEORY and the Standard Model Dirac Page 30| Abby's Magazine - www.AbbysMag.com