When Nazi Germany occupied Denmark during World War II, Niels Bohr and George de Hevesy dissolved Max von Laue's and James Franck's Nobel Prize medals (entruste

When Nazi Germany occupied Denmark during World War II, Niels Bohr and George de Hevesy dissolved Max von Laue's and James Franck's Nobel Prize medals (entrusted to Bohr for safekeeping) in aqua regia. After the war, Hevesy found the flask of dissolved gold undisturbed, and precipitated the gold for the medals to be recast. https://www.aip.org/history-programs/news/invisible-prize https://www.aip.org/history-programs/news/invisible-prize