At this time, the end of the sixth millennium and the fifth millennium BC, the first Neolithic cultural groups appear in Egypt. The quantity of archaeological finds does not yet allow us to trace the merging of the Epipaleolithic traditions of the Nile Valley with the cultures of immigrant groups.
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12 (same as electron) The positron or antielectron is the antiparticle or the antimatter counterpart of the electron. The positron has an electric charge of +1 e, a spin of 1/2 (same as electron), and has the same mass as an electron. When a positron collides with an electron, annihilation occurs.