An appreciation of Bob Alvarez, a fearless advocate for those harmed by the US nuclear weapons complex, a former Energy Department official and US Senate staffer, and a longtime Bulletin contributor ...

They are also, in a way the Pentagon likely never intended, a disconcerting form of art: surreal balls of fire and ash set ...

Researchers at Chalmers University of Technology in Sweden discovered a new phenomenon that changes what we know about nuclear fission.