Feb 19, 2014 — In 2012, Sister Megan Rice, 84, and two other activists broke into Tennessee's Y-12 National Security Complex, where bomb-grade uranium is stored. Rice had asked the judge to show her "no leniency."
Feb 12, 2014 — Researchers from California's Lawrence Livermore National Laboratory say they've figured out how to get their laser to squeeze hydrogen atoms together to make helium atoms, releasing energy in the process. It's an important step in the decades-long quest for fusion energy.
Nov 8, 2013 — Secretary of State John Kerry is joining the talks in Geneva, boosting expectations about a preliminary agreement. A deal might include some sanctions relief for Iran in exchange for it agreeing to suspend efforts to enrich uranium.
Apr 5, 2013 — The U.S. and its allies are on one side of the table. Iran is on the other. The talks are set to continue Saturday in Kazakhstan.
Feb 25, 2013 — Talks start Tuesday in Kazakhstan. The U.S. and its allies want Iran to give up any ambitions for nuclear weapons. Iran says its nuclear program is for peaceful purposes.
Feb 12, 2013 — Analysts also say North Korea's claim that the device was smaller and lighter than ones it previously tested might be a sign it has moved closer to being able to fit a weapon on to a missile. Leaders around the world are condemning North Korea's actions.
Sep 23, 2012 — A little-known, but longtime nuclear standoff ended this week when U.S. Defense Secretary Leon Panetta lifted a 26-year-old ban that kept New Zealand naval ships from docking at U.S. bases. The ban stems from New Zealand's nuclear-free policy that forbids U.S. nuclear ships into its ports.
May 24, 2012 — Negotiations over Iran's nuclear program may not have made any obvious progress, but diplomats at least agreed to keep talking.
May 23, 2012 — The U.S. and other world powers hope to lay out a step by step process that will eventually lead to an end to Iran's nuclear enrichment program. Iran hopes to ease punitive sanctions that are choking its economy.
May 22, 2012 — Yukiya Amano, director-general of the International Atomic Energy Agency, said today that Iran has agreed to steps that will let international inspectors learn more about its nuclear program.