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"In a billion years [from now], it seems, intelligent life might be as different from humans as humans are from insects . To change from a human being to a cloud may seem a big order, but it's the kind of change you'd expect over billions of years." Freeman Dyson, Statement made in 1986, quoted in Asimov's Book of Science and Nature Quotations, p. [American mathematician.]"Slowness has really nothing to do with the question.
An event is not any more intrinsically intelligible or unintelligible because of the pace at which it moves.
Radiocarbon dating cannot be used for older specimens, because so little carbon-14 remains in samples that it cannot be reliably measured.
Fortunately, those variations can be calibrated by tree rings. Third, when organic material is created by living things (such as when trees grow wood), the carbon-14 fraction in those living things matches the fraction in the atmosphere.