Most animals have their own version of tree rings. Here's how we biologists use them to help species thrive
We have a natural fascination with time—how landscapes have been carved over millennia, how our bodies grow and sag with age, ...
PBS13y
Build a Tree-Ring Timeline
Assessing the age of a living tree is straightforward ... like Methuselah are more challenging to count, because the trunks are so distorted that new rings may form at right angles to ones formed ...