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In addition, there are tiny amounts of the unstable isotope carbon-14 (14C) on Earth.
However, by itself a fossil has little meaning unless it is placed within some context.(The circle on the localization map indicates the studied area; red numbers, number of the sample in Table 2.) The Toumaï cranium is precisely located in the TM 266 section.(Toumaï) (1, 2) have changed substantially the understanding of early human evolution in Africa (1–4).When cosmic rays enter the atmosphere, they undergo various transformations, including the production of neutrons.The resulting neutrons participate in the following reaction: n 14N is relatively common, as nitrogen constitutes nearly 80% of Earth's atmosphere.