Tim Frank was stressed out. Once conservators pried the time capsule open, he feared, they might find a mangled mess: a tattered flag, shredded papers, and a rollicking party of flies or silverfish. “My heart was racing through the whole thing,” he says. Frank is a historian at Arlington National Cemetery, the military burial ground in Virginia just outside Washington, D.C. On October 13, 1915, when construction was beginning on the Memorial Amphitheater, a memorabilia box was sunk behind the cornerstone to fete the project. The copper box was stuffed…
