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Greisen–Zatsepin–Kuzmin limit — The Greisen–Zatsepin–Kuzmin limit (GZK limit) is a theoretical upper limit on the energy of cosmic rays (high energy charged particles from space) coming from distant sources. The limit is 5×1019 eV, or about 8 joules. The limit is set by slowing … Wikipedia
MUSIC — This article is arranged according to the following outline: introduction written sources of direct and circumstantial evidence the material relics and iconography notated sources oral tradition archives and important collections of jewish music… … Encyclopedia of Judaism

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