Matter and antimatter have been caught coexisting - again. A second attempt to detect long-sought Majorana fermions, particles that can act as their own antiparticle, has come up positive, suggesting the strange particles are real. Fermions such as electrons and quarks, the particle building blocks of matter, have antiparticles that are identical except for their charge. When the two meet, they annihilate in a puff of energy. But in 1937, Italian physicist Ettore Majorana proposed a hypothetical particle that is its own antiparticle. Both would have zero charge and the two could coexist without annihilating.
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