A historic Hunter Creek Valley building was excavated and tree-ring dated on Friday, Sept. 20. The building, which experts think housed farm animals, is made of wood that is around two centuries old, ...

Architect James Richärd, who remembers grade-school trips to the University of Arizona's giant tree-ring specimens, has designed a $12 million "treehouse" to display them. The new building, mostly ...

Perhaps you’ve wandered through a forest or strolled into a neighborhood park and found tree trunks — and wondered if counting the rings on a trunk is truly a way to know the tree’s age. “Most of us ...