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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noun (plural neutrinos). A neutral subatomic particle with a mass close to zero and half-integral spin, which rarely reacts with normal matter. Three kinds of neutrinos are known, associated with the electron, muon, and tau particle.Example sentences. 1  The leptons consist of the charged electron, muon and tau, together with three electronically neutral particles-the electron neutrino, muon neutrinos and tau neutrinos.2  The proton and the neutron are baryons; the electron, the muon, and the neutrino are leptons; whilst the pions are mesons.xample sentences. 1  The leptons consist of the charged electron, muon and tau, together with three electronically neutral particles-the electron neutrino, muon neutrinos and tau neutrinos. 2  The proton and the neutron are baryons; the electron, the muon, and the neutrino are leptons; whilst the pions are mesons.