Nuclear weapons haven’t been tested in the United States since 1992. Find out why, and what could happen if the hiatus ends.

Seventy years have passed since a team of 49 scientists, led by Italian-born Enrico Fermi, succeeded in creating the world's first self-sustaining nuclear chain reaction. Seventy years have passed ...

Two billion years before we made history and split the atom, the Earth had already accomplished it and was running its own ...

Many advances in technology spring from the mind of a single genius, but others, like nuclear power, are the product of many minds over generations.

December — Dr. Enrico Fermi achieves the first controlled nuclear chain reaction, with a natural uranium device moderated with graphite. Fermi conducted the process using the first demonstration ...

The United States maintains an arsenal of thousands of nuclear weapons, but it hasn't tested one in decades. Instead, the U.S. is using simulations and experiments to see if the nukes still work.

Photo by Bortzells Esselte, courtesy AIP Emilio Segre Visual Archives. Enrico Fermi (1901-1954) left Italy in 1938 to receive the Nobel Prize for physics in Sweden. He never went back. He and his wife ...