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If the life of a radioactive substance is taken to mean the time that elapses before the activity drops to zero, then it is clear from the graph below that we would be waiting forever!

Furthermore, if a sample has been contaminated, scientists will know about it.This rare, unstable isotope is produced from ordinary nitrogen 14.In earth's upper atmosphere, on the edge of what is commonly called outer space, light atomic nuclei from unknown sources outside of our solar system traveling at speeds approaching the speed of light called rain down continuously. Immer wenn ein Lebewesen stirbt, beginnt eine Stoppuhr zu laufen.Die Wissenschaft kann diese Uhr ablesen und so das Alter eines Fundes ermitteln. Source unknown — possibly das Museum für Vor‑ und Frühgeschichte (the Museum for pre‑ and early history) in Berlin.

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