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Their combined discoveries, recently reviewed here and here, have shed light on how genetic differences accumulate over time and have advanced methods of genetic dating. All of these methods measure the amount of electrons that get absorbed and trapped inside a rock or tooth over time.
Go back farther and our lineage meets up with Neanderthals, then chimps, and eventually all primates, mammals, and life. After another 5, years half of the remaining amount of carbon 14 decays to by half again so that only one quarter of the original amount is left, and so on. A good example occurs with the work on the boundary mark known for about 50 years now as the Cretaceous-Tertiary boundary.
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