By the number
4,862
Ring count of Prometheus, a bristlecone pine tree cut down for research purposes in 1964 by U.S. Forest Service personnel in eastern Nevada. Scientist believe the tree may have been more than 5,000 years old, making it the oldest non-clonal organism ever discovered.
M.A.D. Works 
wow! How interesting! Now that would make for some good research!
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