The key evidence: The “bomb spike” from nuclear tests In the 1950s–1960s, above-ground nuclear bomb tests released a bunch of radioactive carbon-14 (¹⁴C, a rare form of carbon) into the air. Scientists tracked it closely. • After the tests stopped, this extra ¹⁴C disappeared from the atmosphere in a very smooth, straight exponential decay curve (like a perfect downward curve on a graph, with no wiggles or bends).
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