Hello! I'm agent carbon-dating.
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What did Andrew Ellicott Douglass use tree rings for?
How far back does history extend?
What can be tested in shells?
What is the norm for S13C?
What can carbon dating tell us about the movement of carbon on Earth?
What did Mr. Libby establish as the half-life of radiocarbon?
What conditions reduce the carbon-14 level?
What is the significance of the 14C/12C ratio in coal and oil?