As President Biden and Group of Seven leaders gathered in Hiroshima, people in Japan wanted the setting to act as a powerful symbol for consensus toward banning nuclear arms.
J. Robert Oppenheimer, the father of the atomic bomb, lost his security clearance "through a flawed process that violated the Commission's own regulations," according to the Department of Energy.
The bombings of Hiroshima and Nagasaki were said at the time to be justified as the only way to end World War II. Seventy-five years later, legal experts say they would now be war crimes.
In 1961, it was Jack ReVelle's job to make sure two hydrogen bombs that had accidentally dropped over North Carolina didn't explode. At StoryCorps, he tells his daughter about recovering the bombs.
Roenneberg was just 23 when his team of resistance fighters parachuted into a mountain range in Norway. They skied to a plant making heavy water and blew Hitler's atomic plans off-schedule.
An "unspoken alliance" between scientists and the military had been brewing for millennia prior to Hiroshima. Neil deGrasse Tyson and Avis Lang excel at detailing this union and its possible future.
On Dec. 2, 1942, a group of scientists in Chicago created the first controlled, self-sustained nuclear chain reaction, which would prove essential to developing an atomic bomb a few years later.
The new Manhattan Project National Historical Park tells the story of how scientists created the world's first atomic bomb. But how fully the story will be told is intensely controversial.