Tree rings can reveal more than just a tree's age. A dendrochronologist studies growth rings to determine dates and environmental conditions of the past. The basis of the science lies in a tree's ...

Two medieval rings that were discovered by metal detecting friends in Norfolk have sold for a combined price of £30,000.

Dendrochronology, or tree-ring dating, provides absolute dates in two different ways ... and the world's oldest living thing. His growth rings document nearly 47 centuries of survival.

Although the most accurate climate data only dates back 200 years or so ... was based on an analysis of the isotopes found in the tree rings. Changes in these isotopes reflected rainfall ...