Atomic Anniversary

A cube of uranium is displayed Wednesday, July 15, 2020, at the National Museum of Nuclear Science and History in Albuquerque, N.M. The "Dark Cube" was part of Adolf Hilter's last attempt at a nuclear reactor and represented a threat that helped to propel the United States' secret Manhattan Project to develop the atomic bomb. Thursday marked the 75th anniversary of the world's first atomic detonation. (AP Photo/Susan Montoya Bryan)