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Dates were assigned to Southwestern ruins with certainty.
In 1929, with a beam from Show Low, Arizona, Douglass was able to bridge the gap for the first time ever.
By 1949, he had published a paper in Science showing that he had accurately dated samples with known ages, using radiocarbon dating.
Douglass passed away just two years after Libby received the Nobel Prize for his work in 1960.
Fifty, 20, or 100 years is a lot of time, wherein a lot can happen.
Fifty years is the difference between Alexander Graham Bell's telephone and television.
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In its most conventional form, dendrochronology works like so.