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===About Antiparticles===
*Many [[Subatomic Particle|particle]]s of [[matter]] have [[antimatter]] counterparts which have the same [[mass]] but opposite [[Electrical Charge|electrical charge]].
*[[Antiparticle]]s are generally denoted by a bar over the top of the symbol used for their [[matter]] counterpart.
*During [[Pair-Production|pair-production]] a [[Subatomic Particle|particle]] and its '''antiparticle''' appear.
*When a [[Subatomic Particle|particle]] meets its '''antiparticle''' they [[Annihilation|annihilate]] one another producing a pair of [[photon]]s.