Against the Grain
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https://www.newswise.com/articles/ancient-tree-rings-reveal-largest-ever-solar-storm?fbclid=IwAR2dOivn7jr9KgShZoOT-WuLgltFuKUsk1Ovh32HCkYzMUW5GICcS4aQJ-Y#:~:text=Newswise%20%E2%80%94%20An%20international%20team%20of,storm%2C%20the%20biggest%20ever%20identified.
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