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Dendrochronology and radiocarbon dating have intertwined histories, she explains, with roots firmly planted at the UA.

"Radiocarbon dating has been a revolution in terms of the way stuff is dated in the past and is used by scientists all over the world," Pearson adds.

The 18-year space race between the Soviet Union and United States yielded the first moon landing.

It took just short of 10 years for the Ancient Greeks to build the Parthenon on the Acropolis of Athens. Charles Darwin spent just five weeks in the Galapagos, a voyage without which he would have never written On the Origin of Species.

Sometimes a wood sample doesn't have enough tree rings or rings with growth patterns that match an already dated sample.

Sometimes important and large groups of matching samples, called "floating chronologies," remain undated.

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