The world's oldest known living tree, a conifer that first took root at the end of the last Ice Age, has been discovered in Sweden. The visible portion of the 13-foot-tall 'Christmas tree' isn't ancient, but its root system has been growing for 9,550 years.
Discovered in 2004, the lone Norway spruce - of the species traditionally used to decorate homes during Christmas - represents the planet's longest-lived identified plant.
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