Science and technology

Associated Press
This photo provided by National Park Service shows a tombstone for a the amputated arm of Confederate Gen. Thomas J. "Stonewall" Jackson near Orange County, Va. On Friday, May 10, 2013, the 150th anniversary of Jackson's death, a trauma surgeon with experience on the battlefield in Iraq and Afghanistan has reinvestigated the medical record to offer a diagnosis of Jackson's death. University of Maryland surgeon Joseph DuBose says Jackson likely died of pneumonia. He is confirming the diagnosis given by Jackson's physician, the famed Confederate doctor Hunter McGuire. (AP Photo/National Park Service)

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