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As the best known particle in its class, we use photons to develop Photodynamics, but it applies to all particles that travel at the speed of light. The photon is the most abundant and readily available elementary particle we know, and yet it is arguably still the most mysterious and ill understood. We do know that it has a frequency ω0, an energy 0 w  , and an angular momentum  either aligned or anti-aligned with its direction of motion. On the other hand, there are a number of troubling, unanswered questions, and inconsistencies with our present understanding of the photon. Let us list a few of these. Most particles can travel at different speeds, but the photon cannot. Why? How can a photon go from zero to the speed of light when a flashlight is turned on without going at any speed in between? Using E = mc2 a photon is seen to have a constant mass 2 0 m c w =  and travels at the speed of light. Why can't atomic particles with the same constant mass go at the speed of light? The energy of most particles depends on their speeds, but the photon's energy does not. Why? A photon can lose energy for 13.8 billion years and keep going at the speed of light (CMBR) [1-3]. Why? What causes the photon to travel at the speed of light, and what is the physical mechanism which prevents the photon from going faster than the speed of light? The photon's energy is 0 w  . What is revolving at angular frequency

Photodynamics: How Massive Photons, Gravitons, Gluons, and Neutrinos Manage to Travel at the Speed of Light