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https://www.heritagedaily.com/2017/02/what-happened-to-the-sun-over-7000-years-ago-analysis-of-tree-rings-reveals-highly-abnormal-solar-activity-in-the-mid-holocene/114100
What Happened to the Sun over 7,000 Years Ago? Analysis of tree rings reveals highly abnormal solar activity in the mid-Holocene