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According to information on Spaceweather.com, Nagoya University PhD student Fusa Miyake made an important discovery in 2012 while studying the stump rings of a 1,900-year-old Japanese cedar tree. Signs of extraordinary cosmic radiation in tree rings: Miyake events One ring, in particular, caught his eye. Grown in A.D. 774-75, it contained a 12 percent increase in carbon-14 (14C), a n isotope ...
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