Antimatter is a type of matter composed of antiparticles, which have the same mass as particles of ordinary matter but opposite charges and quantum numbers. When antimatter comes into contact with regular matter, they annihilate each other, releasing energy according to Einstein's equation, $$E=mc^2$$. This property of annihilation makes antimatter a fascinating subject in both theoretical and experimental physics, particularly in the context of fundamental symmetries and the Dirac equation.
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