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At a tree ring conference in the relatively treeless city of Tucson, Arizona, three scientists walk into a bar. The trio gets to talking, trying to explain a mysterious set of core samples from the Florida Keys. At some point, they come up with a harebrained idea: put the tree rings next to a seemingly unrelated dataset. Once they do, they notice something that no one has ever noticed before, a force of nature that helped shape modern human history and that is eerily similar to what’s happening on our planet right now. With help from pirates, astronomers and an 80-year-old bartender, this episode will change the way you look at the sun. (Warning: Do not look at the sun.)  Special thanks to Scott St George, Nathaniel Millett, Michael Charles Stambaugh, Justin Maxwell, Clay Tucker, Willem Klooster, Kevin Anchukaitis EPISODE CREDITS Reported by - Latif Nasser with help from - Ekedi Fausther-Keeys and Maria Paz Gutierrez Produced by - Maria Paz Gutierrez and Pat Walters with help from - Ekedi Fausther-Keeys a