Not to celebrate it, but to serve as a reminder.

Seventy-eight years ago, on July 16, 1945, a plutonium implosion device was tested at a site 210 miles south of Los Alamos, New Mexico.

For the details, including photos, which should give us pause, here’s a report from the Air Force Nuclear Weapons Center.

From J. Robert Oppenheimer: We knew the world would not be the same. A few people laughed, a few people cried. Most people were silent.

More quotes on the event here.