Over Christmas vacation in 1938, physicists Lise Meitner and Otto Frisch received puzzling scientific news in a private letter from nuclear chemist Otto Hahn. When bombarding uranium with neutrons, Hahn had made some surprising observations that went against everything known at the time about the dense cores of atoms – their nuclei. Theconversawtion.com

Two Air Force generals — one the current U.S. Strategic Forces commander, the other his predecessor — declared publicly this month that they would defy a presidential nuclear launch order if they found it violated the Law of War. So what are the Law of War’s constraints are on a nuclear strike and could it be a plausible check on President Trump’s unilateral power to launch a nuclear strike? Npr.org

There are signs that North Korea’s submarine missile program is expanding as it prepares its second test, adding to the risk that the nuclear-armed country could one day threaten the U.S. or its Asian allies with yet another powerful weapon in its arsenal. Cnbc.com

The Talen Energy Corp. on Friday disputed allegations that it retaliated against two of its nuclear power plant employees for reporting a workplace injury. Standardspeaker.com