I'm thinking  *Iodine* and the conspiracy theory about Project Cumulus and the 1952 Lynmouth Flood

 The Napoleonic bit refers to Barnard Courtois discovery of Iodine while developing a process to synthesize saltpeter from seaweed.

Steve Mikell
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The Question: This element is essential for human health but not for plants. An experimental application of this element resulted in a natural disaster in 1952. A final clue - the Napoleonic Wars. What element is being described?


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