Research has been ongoing since the 1960s to determine what the proportion of in the atmosphere has been over the past fifty thousand years.
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The older a sample is, the less (the period of time after which half of a given sample will have decayed) is about 5,730 years, the oldest dates that can be reliably measured by this process date to around 50,000 years ago, although special preparation methods occasionally permit accurate analysis of older samples.
The idea behind radiocarbon dating is straightforward, but years of work were required to develop the technique to the point where accurate dates could be obtained.
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of his lewd remarks about women, more video of similar comments made by Trump is surfacing.