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Atomic Bomb time markers

It turns out that virtually every tree that was alive starting in 1954 has a “spike” — an atomic bomb souvenir. Everywhere botanists have looked, “you can find studies in Thailand, studies in Mexico, studies in Brazil where when you measure for carbon-14, you see it there,” Nadkarni says. All trees carry this “marker” — northern trees, tropical trees, rainforest trees — it is a world-wide phenomenon.”

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