in original) The only statement that may pertain to the sparkplug was declassified in 1991: "Fact that fissile and/or fissionable materials are present in some secondaries, material unidentified, location unspecified, use unspecified, and weapons undesignated." In 1998, the DOE declassified the statement that "The fact that materials may be present in channels and the term 'channel filler,' with no elaboration," which may refer to the polystyrene foam (or an analogous substance). (DOE 2001, sect. V.C.) Whether the statements vindicate some or all of the models presented above is up for interpretation, and official US government releases about the technical details of nuclear weapons have been purposely equivocating in the past (such as the Smyth Report). Other information, such as the types of fuel used in some of the early weapons, has been declassified, but precise technical information has not been. The Progressive case Most of the current ideas of the Teller–Ulam design came into public awareness after the DOE attempted to censor a magazine article by the anti-weapons activist Howard Morland in 1979 on the "secret of the hydrogen bomb." In 1978, Morland had decided that discovering and exposing the "last remaining secret" would focus attention onto the arms race and allow citizens to feel empowered to question official statements on the importance of nuclear weapons and nuclear secrecy. Most of Morland's ideas about how the weapon worked were compiled from highly-accessible sources, the drawings that most inspired his approach came from the Encyclopedia Americana. Morland also interviewed, often informally, many former Los Alamos scientists (including Teller and Ulam, though neither gave him any useful information), and used a variety of interpersonal strategies to encourage informational responses from them (such as by asking questions such as "Do they still use sparkplugs?" even if he was unaware what the latter term specifically referred to). (Morland 1981) Morland eventually concluded that the "secret" was that the primary and secondary were kept separate and that radiation pressure from the primary compressed the secondary before igniting it. When an early draft of the article, to be published in The Progressive magazine, was sent to the DOE after it had fallen into the hands of a professor who was opposed to Morland's goal, the DOE requested that the article not be published and pressed for a temporary injunction. After a short court hearing in which the DOE argued that Morland's information was (1). likely derived