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These three things are really different, and all have made a difference in our world. Check out this list of things that were invented in Arizona.

The world's oldest living tree is in the National Forest White Mountains in California, USA.

The ponderosa pine is one of the most ubiquitous conifer species in western North America. In the American Southwest, winter snowmelt and summer rains play a critical role in ponderosa forests' survival, but the 23-year megadrought may have these semi-arid trees at the end of their rope, according to new research by UArizona scientists.

From Prometheus and Methuselah to trees in remote forests of China, these are the most ancient known trees on Earth.

Andrew Ellicott (A.E.) Douglass graduated from Trinity College in 1889 and eventually became known as the “father of dendrochronology.”