Only one (or possibly two) of the missing bombs was fully assembled at the time it was lost. The total number of confirmed ...

They are all "subcritical," meaning that they simulate conditions inside a nuclear weapon without triggering a nuclear chain reaction. That runaway chain reaction, in which some atoms split apart and ...

By 1932 the neutron particle was recognized and added to the nuclear mix ... trigger a similar reaction in nearby atoms, creating a self-sustaining chain reaction,” writes Ms. Santos.

Learn more here. In 1942, the Manhattan Project needed to create a chain reaction—a crucial step toward proving that it would be possible to make an atomic bomb. The scientists achieved this sustained ...

The U.S. hasn't tested a nuclear weapon in decades, and since the 1990s has used simulations and experiments to verify they're working properly. NPR was granted a rare look at how they do it.

By the end of the year the physicist Werner Heisenberg had calculated that nuclear fission chain reactions might be possible. When slowed down and controlled in a "uranium machine" (nuclear ...

A Brief History Nuclear power has had its share of ups and downs since its inception. The idea of harnessing the energy from ...

A third part is fusion is not a chain reaction, so the danger of runaway nuclear reactions and explosions is non-existent. Since generating electricity is responsible for about a third of global ...

It's also worth noting there's no chain reactions with nuclear fusion, meaning no chance for a meltdown at an energy plant. "It's not like the next power source," said Needham. "It is the final ...

Nuclear reactors are devices designed to initiate and control sustained nuclear chain reactions to generate nuclear energy in the form of heat, used for electricity generation and various industrial ...

The push for nuclear energy is part of India's commitment to achieve 500 GW of non-fossil fuel-based energy generation by ...