Tech

X-ray analysis confirms forged date on Lincoln pardon of Civil War soldier

Enlarge / Abraham Lincoln’s pardon for Patrick Murphy, a Civil War soldier in the Union Army who was court-martialed for desertion. (credit: National Archives) There’s rarely time to write about every cool science-y story that comes our way. So this year, we’re once again running a special Twelve Days of Christmas series of posts, highlighting […]

Tech

Restricted Data explores controversial history of nuclear secrecy

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 […]