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For each particle of matter there exists an
equivalent particle with opposite quantum characteristics, called an
anti-particle. Particle and anti-particle pairs can be created by
large accumulations of energy and, conversely, when a particle meets
an anti-particle they annihilate with intense blasts of energy. At
the time of the big-bang, the large accumulation of energy must have
created an equal amount of particles and anti-particles. But in
everyday
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