Enlarge / A “Restricted Data” classification stamp on a document from the US Atomic Energy Commission in the early 1950s. The document pertains to the classification of opacity calculations that were part of the work on the hydrogen bomb. The document is no longer classified and is available in the US National Archives. (credit: Alexander […]
Enlarge / In 1953, the eminent physicist and H-bomb advocate took an ill-fated overnight train from Philadelphia to Washington, DC, that would indirectly lead to the Robert Oppenheimer security hearing. (credit: Michail_Petrov-96/iStock/Getty Images) In the popular science world, physicist John Wheeler is probably best known for popularizing the term “black hole,” although his research spanned […]