On the eve of his historic trip to Hiroshima, President Barack Obama is defending the vigor of his efforts to rid the world of nuclear weapons. He says he will use his visit to the Japanese memorial site on Friday to underscore “the sense of urgency that we all should have.” abcnews.go.com

The U.S. nuclear weapons system still runs on a 1970s-era computing system that uses 8-inch floppy disks, according to a newly released report from the Government Accountability Office. npr.org

Iranian and Russian officials are discussing building several new nuclear power plants in Iran, according to an article published Thursday by the news agency Trend. dailycaller.com

The Fusioneers: Forget cars, these guys build nuclear reactors in their back yards. washingtonpost.com