As the world marks the 80th anniversary of the first use of a nuclear weapon, on the Japanese city of Hiroshima near the end of World War II, the planet is closer to seeing them used again than it has been in decades,

Japan and the world commemorated the 80th anniversary of the atomic bombing of Hiroshima, inaugurating a new era of human history. At 8:15 a.m. on Aug. 6, 1945, the American B-29 bomber known as the Enola Gay dropped an atomic bomb on the Japanese city of Hiroshima,