July 16, 1945. At 5:29 in the morning, in a stretch of New Mexico desert so brutal the Spanish had named it the Journey of the Dead Man, the United States detonated the first nuclear weapon in history.
They called the test Trinity and they called the bomb itself the Gadget. Nobody was totally sure what would happen. Scientists had a betting pool going on the yield, and a couple of them had quietly worried whether the thing might ignite the atmosphere itself. They went ahead anyway.
The flash lit up the mountains brighter than the sun. People felt it 100 miles away, windows rattled in distant towns, and the heat fused the desert sand into a weird green glass that scientists later named trinitite. The Army put out a cover story that an ammunition dump had exploded.
Robert Oppenheimer later said that watching it, he thought of a line from Hindu scripture. Now I am become Death, the destroyer of worlds. Another physicist there put it more bluntly and said now we are all sons of bitches. Three weeks later Hiroshima was gone. The world changed at dawn in a desert on this day.