Tree rings show tree's age

September 28, 2009 | 6:26 p.m. CDT
A cross section of red pine sample from Huron Mountain Club, in the upper peninsula of Michigan shows that the tree grew from 1707 until it died naturally in 1998. The numbers in black identify the actual years that the tree healed over wounds caused by fire.

RELATED STORIES: Dendrochronologists at MU use tree rings to reveal answers from the past