Enola Gay departs for Hiroshima, ushering in the nuclear age

A B-29 named after a pilot's mother lifted off from a Pacific island on a Tuesday morning, carrying a single bomb that weighed as much as 10 cars and would, within hours, kill 70,000 people instantly.

The Enola Gay—named for Enola Gay Tibbets, mother of the plane's 29-year-old pilot, Colonel Paul Tibbets—departed Tinian Island at 2:45 a.m. on August 6, 1945, carrying "Little Boy," a uranium-235 device no one had ever tested. Not once. The Los Alamos scientists had run calculations, built scale models, argued in rooms, but the first and only full-scale trial would happen over a city. This was not caution; this was confidence bordering on the hallucinatory.

The numbers around that flight are almost too neat, as if history was being written by someone who liked round figures. The plane flew 1,200 miles to Hiroshima. The bomb's blast radius would eventually claim a 1-mile radius of total destruction. The temperature at ground zero reached 7,000 degrees Fahrenheit—hot enough that shadows burned themselves into stone. By the end of 1945, the death toll from the initial blast and subsequent radiation would climb to 140,000.

Tibbets was 29. His bombardier, Thomas Ferebee, was 25. The weaponeer aboard, Captain William Parsons, was 34 and had only assembled the final bomb components mid-flight because no one wanted to risk an accident on takeoff. (The irony of this caution, given what the plane was doing, seems to have escaped everyone.) The entire crew was young enough that most had no memory of the Depression, and several would spend the rest of their lives explaining themselves to people who had watched the newsreels.

The flight took 6 hours and 15 minutes. The bomb was dropped at 8:15 a.m. local time. In the seconds before impact, no one on the ground knew what was coming. The city had endured months of firebombing raids, so when sirens wailed, many people didn't bother running. Some thought it was a false alarm. Others simply had nowhere left to run to.

What's often forgotten: the Enola Gay crew didn't see what happened. They were 31,000 feet up and 11.5 miles away when Little Boy detonated. Tibbets felt the plane shudder from the shock wave. His weapons officer saw the mushroom cloud rise to 40,000 feet in 37 minutes. But the actual moment of destruction—the vaporization, the burning, the crushing—happened in the dark below, invisible to the men who made it happen. They knew only that something enormous had worked.

Tibbets lived until 2007, writing a memoir, giving interviews, never quite apologizing but never quite celebrating either. He seemed to exist in the strange middle ground of a man who had done exactly what his government asked him to do, at exactly the moment when doing it seemed like winning, and then watched the moral ground shift beneath his feet for the next 62 years.

The Enola Gay itself survived the war. It's in a museum now, in Washington, D.C., where visitors can walk underneath it and look up at its belly—the place where Little Boy hung, inert and patient, waiting for the moment when physics and policy would meet at 31,000 feet.

A delivery truck pulled up to the United States Embassy in Nairobi on the morning of August 7, 1998, and nobody who saw it thought twice. It was a Friday. The city was warm and ordinary. Inside the embassy, people were at their desks doing the work embassies do—visa applications, diplomatic cables, the bureaucratic hum of American presence abroad. Then the truck detonated, and in the space of a few seconds, the building collapsed inward like a lung deflating.

Two hundred and thirteen people died in Nairobi. Eleven more in a simultaneous blast in Dar es Salaam, Tanzania, 400 miles away. The coordination alone should have alarmed everyone immediately, but the real shock was what came next: the realization that this hadn't been some accident, some local grievance, some comprehensible motive. This was a statement, carefully planned and executed with the kind of precision that suggested an organization with resources, ideology, and patience.

The architects were Al-Qaeda operatives, specifically a cell led by a man named Mohamed Rashed Daoud Al-'Owhali, who was in the truck when it exploded and somehow survived. He had driven it to the embassy entrance, parked it, and then—in a moment that contains its own strange logic—he threw stun grenades at the security barriers first, as if warning them, as if there were rules. There weren't. The truck bomb itself carried roughly 2,000 pounds of TNT and aluminum nitrate, a fertilizer mixture that produces a blast wave of devastating efficiency. The chemistry was deliberate: aluminum nitrate amplifies the TNT's explosive force by providing additional oxygen during detonation. This wasn't improvisation. This was engineering.

What made August 7, 1998, the genuine hinge point wasn't just the death toll or even the sophistication of the attack. It was that almost nobody in the American government had been paying serious attention to Osama bin Laden. He was a name in files, a former CIA asset turned troublemaker, someone with money and ideology but seemingly limited reach. The 1993 World Trade Center bombing had been attributed to other groups. The Oklahoma City bombing in 1995 was domestic. The assumption—comfortable, widespread, and now obviously wrong—was that major terrorist threats came from sources Americans thought they understood: state actors, recognizable ideologies, familiar enemies.

Bin Laden's declaration of war against the United States had come in 1996, issued from Afghanistan, largely unread outside intelligence circles. His fatwa calling for the killing of Americans came in 1998, the same year as these bombings. He was announcing himself, but the world wasn't listening yet. The embassy attacks were his way of making sure it would.

Within weeks, the Clinton administration launched cruise missile strikes against suspected Al-Qaeda camps in Afghanistan and a pharmaceutical plant in Sudan. The strikes killed roughly 20 people and missed bin Laden entirely. They also, inadvertently, elevated him from regional operative to international antagonist—exactly the kind of publicity an organization like Al-Qaeda needed. The United States had just taught him that attacking American targets worked. It drew attention. It provoked response. It proved his thesis that the superpower could be wounded.

Three years later, Al-Qaeda would prove it again, far more spectacularly, on September 11. But the real beginning—the moment when the world shifted from assuming safety to confronting a new kind of threat—happened in Nairobi, in a truck that arrived on a Friday morning when nobody was looking for it.