Late-stage Nagasaki mushroom cloud. From Nagasaki Museum's exhibit at Google Cultural Inst.: http://www.google.com/culturalinstitute/asset-viewer/mushroom-cloud/AQGmcjaCxCSYAQ?projectId=historic-moments …pic.twitter.com/3UF2nSIsEU
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Note that this is an example of the fact that with yields in the 10s of kilotons, you get very non-mushroom stem/head ratios. More columnar.