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Scientists have measured the half-life of carbon-14 atoms to be approximately 5,700 years.
At the same time, the environment constantly produces new carbon-14, so that the percentage of carbon-14 in all living plants and animals remains fairly constant.
Thus they became Homo-sapien neanderthalensis, and Homo-sapien Cro-Magnonensis, that leaves Modern Man with the really screwy name "Homo-sapien-sapien" (Man the Wise Wise? Though we do understand that the elevation of Cro-magnon and Neanderthal to Sapien status, does solve a great many problems - none related to science though.
However, the current move to place Cro-magnon with modern man as "Homo-sapien-sapien", is really taking it too far, and it is pointless, as science proves, Caucasians did NOT evolve from Cro-Magnons in Europe.
Carbon-12/14 dating: Carbon-14 atoms decay at a constant rate, because they are radioactive.