https://www.9news.com.au/world/radioactive-traces-tree-rings-earths-history-unexplained-radiation-storms-miyake-events/e789567c-3657-4ab3-ba0e-17db14af8bcd
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<p>Scientists have analysed radioactive signatures left in tree rings around the world to study mysterious "radiation storms" that have swept over Earth.</p>
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